Search Results - S (463 entries)

SA: Shipyard Agreement  (MARAD4)

SAAM: Special Assignment Airlift & Mission  (MTMC1)

Saddle Tank: Fuel storage area on a tractor.  (ATA1)

Saddle-Mount: (See also King-Pin Saddle-Mount, Lower-Half of Saddle Mount, Upper-Half of Saddle Mount) A device, designed and constructed as to be readily demountable, used in driveaway-towaway operations to perform the functions of a conventional fifth wheel.  (49CFR393)

SAE: Society of Automotive Engineers  (49CFR571)   (NHTSA5)

SAFER: Safety and Fitness Electronic Records System  (FHWA15)

Safety Alert: A safety alert issued by Air Traffic Control (ATC) to aircraft under their control.  (FAA8)

Safety Defect: A defect in a product subject to the provisions of the 46 U.S.C. Chapter 43, which creates a substantial risk of personal injury to the public. The defective part or area may be under the provisions of 46 (U.S.C.) Chapter 43, and if so regulated, may or may not be in compliance with that standard.  (USCG1)

Safety Harbor: An area which has been cleared of tree stumps before impoundment of the pool and in which a safe project depth is guaranteed for the mooring of vessels. First-class safety harbors are marked with orange boards. A second-class harbor has project depth only at pool stage, whereas the first class harbor maintains project depth even at drawn down winter levels of the pool. (Term peculiar to the Tennessee River.)  (TNDOT1)

Safety Harbor Landing Markers: White arrow shaped boards pointing in the direction of cleared areas safe for mooring in demand reservoirs (used only on the Tennessee River). They indicate that the site has been cleared of tree stumps to a specified depth.  (TNDOT1)

Safety Landing: Similar to safety harbor except that it consists of a small cleared area along the bank. (Found only on the Tennessee River at present).  (TNDOT1)

SAFI: Semi Automatic Flight Inspection  (FAA7)

Sailboat: Craft intended to be propelled primarily by sail, regardless of size or type.  (USCG2)

Sailing Line: A printed course line appearing on river charts showing the recommended general course at the time the chart was issued. Usually out of date for open rivers; the navigator should consult the latest channel reports.  (TNDOT1)

Saint Lawrence Seaway Development Corporation (SLSDC): The Saint Lawrence Seaway Development Corporation was established by act of May 13, 1954 (33 U.S.C. 981-990), as an operating administration of the Department of Transportation. The Corporation, a wholly Government owned enterprise, is responsible for the development, operation, and maintenance of that part of the St. Lawrence Seaway between the port of Montreal and Lake Erie, within the territorial limits of the United States. The function of the Seaway Corporation is to provide a safe, efficient, and effective water artery for maritime commerce, both in peacetime and in time of national emergency.  (OFR1)

Sales-Weighted Miles Per Gallon: Calculation of a composite vehicle fuel economy based on the distribution of vehicle sales.  (DOE6)

SALS: Short Approach Light System  (14CFR1)

SAM: South American Region  (USTTA1)

SAMIS: Safety Management Information Statistics  (FTA3)

Sampling: A statistical technique for the collection of passenger mile data. The sampling technique may be one of the FTA approved procedures or an alternative methodology which meets FTA's requirements for the statistical reliability (95% confidence and 10% precision).  (FTA1)

SAMS/MAMS: Special Airspace Management System/Military Airspace Management System  (FAA7)

SAN: San Diego International Airport - Lindbergh Field  (FAA11)

Sand Digger: A dredge engaged in obtaining sand and gravel from the riverbed.  (TNDOT1)

SANPRM: Supplemental Advance Notice of Proposed Rulemaking  (RSPA1)

SAR: Search and Rescue  (FAA8)

SAR Facility: (See also Search and Rescue) A regular Reserve operated or augmented, or Auxiliary operated Coast Guard unit, such as an air station, small boat station, base (or support center), group/section, or other shore unit which has search and rescue as a primary mission.  (USCG3)

SARMIS: Search and Rescue Management Information System  (BTS7)

SARPS: Standards and Recommended Practices  (FAA17)   (FAA1)

SARSAT: Search and Rescue Satellite  (FAA8)

SAS: Scandinavian Airlines System  (FAA18)

SAS: Special Airlift Summary  (MTMC1)

SAT: San Antonio International Airport  (FAA11)

SATCOM: Satellite Communications  (FAA17)   (FAA7)

Satellite: A body that revolves around a larger body, such as the moon revolving around the earth, or a man-made object revolving about any body such as the sun, earth or moon.  (AIA1)

SBIR: Small Business Innovation Research  (FTA4)

SBRP: Special Bridge Replacement Program - 1970  (MTMC1)

SBT: Segregated Ballast Tanks  (FHWA12)

SCATS: Sydney Coordinated Adaptive Traffic System  (FHWA15)

SCF: Standard Cubic Foot  (49CFR171)

Scheduled Air Transportation: Establishments primarily engaged in furnishing air transportation over regular routes and on regular schedules. This industry includes Alaskan carriers operating over regular or irregular routes.  (BOC1)

Scheduled Aircraft Miles Completed: The aircraft miles completed on scheduled flights, computed between only those scheduled points actually served.  (BTS5)

Scheduled Airlines, U.S.: Carriers certificated by the Federal government under Section 401 of the Federal Aviation Act permitting the operation of large aircraft larger than 60 seats.  (ATAB1)

Scheduled Revenue Service: The total service scheduled to be provided for picking up and discharging passengers. Scheduled revenue service is computed from internal transit agency planning documents (e.g., run paddles, trip tickets and public timetables), and includes the whole trip (e.g., deadhead, layover/recovery, and actual picking up and discharging of passengers). Schedule service excludes service interruptions and special additional services.  (FTA1)

Scheduled Service: Transport service operated pursuant to published flight schedules, including extra sections and related nonrevenue flights.  (BTS4)   (BTS5)   (BTS6)

Scheduled Service: Transport service operated over an air carrier's routes, based on published flight schedules, including extra sections.  (ATAB1)   (FAA15)

Scheduled Service: Transport service operated over routes pursuant to published flight schedules which are openly advertised with dates or times (or both) or otherwise made readily available to the general public or pursuant to mail contracts with U.S. Postal services.  (FAA11)

Scheduled Service: A scheduled commercial passenger vehicle trip. The scheduled trip is generally offered at preestablished times between designated locations.  (FHWA2)

Scheduled Service: Total service scheduled computed from schedules. Scheduled service excludes service interruptions and special additional services.  (FTA1)

School and Other Nonrevenue Bus: (See also Intercity Bus, Motor Bus, Motorbus, Transit Bus) Bus services for which passengers are not directly charged for transportation, either on a per passenger or per vehicle basis.  (DOE6)

School Bus: See also Public School Transportation.

School Bus: A passenger motor vehicle which is designed or used to carry more than 10 passengers in addition to the driver, and which the Secretary [of Transportation] determines is likely to be significantly used for the purpose of transporting preprimary, primary, or secondary school students to such schools from home or from such schools to home.  (49CFR390)

School Bus: Includes county school buses, private school buses, and buses chartered from private companies for the express purposes of carrying students to or from school and/or school-related activities.  (FHWA3)

School Bus Hours: The vehicle hours of travel by a revenue vehicle while serving as a school bus. School bus hours are only hours where a bus is primarily or soley dedicated to carrying school passengers.  (FTA1)

School Bus Operation: The use of a school bus to transport only school children and/or school personnel from home to school and from school to home.  (49CFR390)

School Bus Related Crash: Any crash in which a vehicle, regardless of body design, used as a school bus is directly or indirectly involved, such as a crash involving school children alighting from a vehicle.  (NHTSA3)

School Bus Service: The operation of buses exclusively to carry school passengers to and from their schools.  (FTA1)

School Buses: Establishments primarily engaged in operating buses to transport pupils to and from school. School bus establishments operated by educational institutions should be treated as auxiliaries.  (BOC1)

School Buses: Type I and Type II school vehicles as defined in Highway Safety Program Standard No. 17, used exclusively to transport school students, personnel, and equipment.  (FTA1)

SCIA: Simultaneous Converging Instrument Approaches  (FAA17)

SCOOT: Split Cycle and Offset Optimization Technique  (FHWAII)

SCR: Shipboard Census Report  (FHWA13)

Scrappage Rate: As applied to motor vehicles, it is usually expressed as the percentage of vehicles of a certain type in a given age class that are retired from use (lacking registration) in a given year.  (DOE6)

SCSI: Small Computer System Interface  (BTS)

SCUBA: Self Contained Underwater Breathing Apparatus

SDAT: Sector Design and Analysis Tool  (FAA7)

SDF: Simplified Direction Finding  (FAA7)

SDF: Standiford Field  (FAA11)

SDR: Service Difficulty Report  (FAA6)

SDRS: Standardized Delay Reporting System  (FAA17)

SEA: Seattle - Tacoma International Airport  (FAA11)

Sea Level Engine: A reciprocating aircraft engine having a rated takeoff power that is producible only at sea level.  (14CFR1)

Sea-Bee Vessels: Ocean vessels constructed with heavy-duty submersible hydraulic lift or elevator system at the stern of the vessel. The Sea-Bee system facilitates forward transfer and positioning of barges.  (MARAD2)

Sea-Land Barge: Barge designed as a container that can be moved directly from the inland waterway to a truck or train and then moved to destination.  (TNDOT1)

Seabee: A type of barge carrying ship, similar to the LASH vessel except it employs a heavy-lift elevator at the stern-end of the ship to lift barges on and off.  (MARAD1)

SEABEE: Sea Barge Carrying Ships  (MARAD1)   (MTMC1)

Seabee System: (See also Lighter-Aboard-Ship) Designed by Lykes Bros. Steamship Co., the system requires a SEABEE lighter or barge and a SEABEE carrier vessel or mother ship. The barges are 97.5 feet long and 35 feet side and have a hatch opening of 85 by 35 feet. The barges are moved down the inland waterway to the mother ship and brought on board by a 2,000-ton immersible elevator which is an integral part of the mother ship. Wheel dollies then transport the barges from the elevator to the point of rest on the ship.  (TNDOT1)

Seaplane Base: Facility used primarily by seaplanes.  (DOI3)

Seaplane Landing/Take-Off: Water area used for seaplanes landing and takeoff.  (DOI3)

Search: The effort expended to locate a distressed unit by a reporting unit in terms of time and distance.  (USCG3)

Search and Rescue (SAR): (See also SAR Facility) A service which seeks missing aircraft and assists those found to be in need of assistance. It is a cooperative effort using the facilities and services of available Federal, state, and local agencies.  (FAA8)

Seat Offered Kilometer: Unit of measure representing the movement over one kilometer or one seat available in an Inland Waterways Transport (IWT) passenger vessel when performing the services for which it is primarily intended over one kilometer.  (TNDOT1)

Seat-Miles: The aircraft miles flown in each inter-airport hop multiplied by the number of seats available on that hop for revenue passenger use.  (FAA11)

Seating Capacity: The number of seats that are actually installed in the vehicle.  (FTA1)

Seating Position: The location of the occupants in the vehicle. More than one can be assigned the same seat position; however, this is allowed only when a person is sitting on someone's lap.  (NHTSA3)

Seating Reference Point (SGRP): The unique design H-point, as defined in Society of Automotive Engineers (SAE) J1100 (June 1984), which: 1) Establishes the rearmost normal design driving or riding position of each designated seating position, which includes consideration of all modes of adjustment, horizontal, vertical, and tilt in a vehicle; 2) Has X, Y, and Z coordinates, as defined in SAE J1100 (June 1984), established relative to the designed vehicle structure; 3) Simulates the position of the pivot center of the human torso and thigh; and 4) Is the reference point employed to position the two-dimensional drafting template with the 95th percentile leg described in SAE J826 (May 1987), or, if the drafting template with the 95th percentile leg cannot be positioned in the seating position, is located with the seat in its most rearward adjustment position.  (49CFR571)

Second In Command: A pilot who is designated to be second in command of an aircraft during flight time.  (14CFR1)

Secondary Airport: An airport receiving approach control service as a satellite to a primary approach control facility, or one at which control is exercised by the approach control facility under tower en route control procedure.  (FAA14)

Secondary Separation Assurance: A backup to the primary means for maintaining aircraft separation.  (FAA7)

Section 15: See National Transit Database.

Section Modulus: A measure of the strength of frame side rails, determined by the cross-section area and shape of the side rails. Section modulus is not affected by the material from which the side rail is made, only by the shape and position of the rail.  (TII1)   (TII2)

Sectional Aeronautical Charts: Designed for visual navigation of slow or medium speed aircraft. Topographic information on these charts features the portrayal of relief and a judicious selection of visual check points for Visual Flight Rules (VFR) flight. Aeronautical information includes visual and radio aids to navigation, airports, controlled airspace, restricted areas, obstructions and related data.  (FAA4)

Sectionalizing Switch: A switch for disconnecting a section of a power line from the source of energy.  (49CFR236)

Sector Suite (S/S): Refers to the composition of functions which directly comprise either the Controller or Sector Suite Console/Support processing elements.  (FAA8)

Sector Suite Work Station: A group of consoles containing displays and input devices whereby Air Traffic Control (ATC) Specialists, Controllers or Supervisors interface with the ACF.  (FAA8)

SECUTC: Southeastern Consortium of University Transportation Centers  (MTMC1)

SED: Shipper's Export Document  (FHWA13)

Self-Propelled Barge: Freight vessel having its own means of mechanical propulsion.  (TNDOT1)

Self-Propelled Pusher Barge: Self-propelled barge designed or fitted to push pushed or pushed-towed barges.  (TNDOT1)

Self-Propelled Pusher Tanker Barge: Self-propelled pusher barge for the bulk transport of liquids or gases.  (TNDOT1)

Self-Propelled River-Sea Navigation Vessel: Inland Waterways Transport (IWT) freight vessel having a carrying capacity of at least 20 tons also designed for the transport of goods by sea and equipped with their own means of propulsion developing at least 37 kilowatts (KW).  (TNDOT1)

Self-Propelled Tanker Barge: Self-propelled barge intended for the bulk transport of liquids or gases.  (TNDOT1)

Semaphore Arm: The part of a semaphore signal displaying an aspect. It consists of a blade fastened to a spectacle.  (49CFR236)

Semaphore Arm Spectacle: That part of a semaphore arm which holds the roundels and to which the blade is fastened.  (49CFR236)

Semaphore Blade: The extended part of a semaphore arm which shows the position of the arm.  (49CFR236)

Semi: (See also Semitrailer, Tractor-Semitrailer, Truck) Semitrailer, used loosely in reference to tractor and semitrailer unit.  (ATA1)

Semitrailer: See also Motor Vehicle, Tractor-Semitrailer, Truck.

Semitrailer: Any motor vehicle, other than a pole trailer, which is designed to be drawn by another motor vehicle and so constructed so that some part of its weight rests upon or is carried by the self-propelled towing vehicle.  (49CFR390)   (49CFR571)

Semitrailer: Truck trailer equipped with one or more axles and constructed so that the front end rests upon a truck tractor.  (ATA2)

SEPTA: Southeastern Philadelphia Transit Authority  (FTA4)

Serious Injury: An injury that results in the amputation of any appendage, the loss of sight in an eye, the fracture of a bone, or the confinement in a hospital for a period of more than 24 consecutive hours.  (49CFR229)

Serious Injury: Any injury which 1) Requires hospitalization for more than 48 hours, commencing within 7 days from the date the injury was received; 2) Results in a fracture of any bone except simple fractures of fingers, toes, or nose; 3) Involves lacerations which cause severe hemorrhages, nerve, muscle, or tendon damage; 4) Involves injury to any internal organ; 5) Involves second or third-degree burns, or any burns affecting more than 5 percent of the body surface.  (FAA2)   (NTSB1)   (NTSB2)

Serious Traffic Violation: Conviction, when operating a commercial motor vehicle, of: 1) Excessive speeding, involving any single offense for any speed of 15 miles per hour or more above the posted speed limit; 2) Reckless driving, as defined by State or local law or regulation, including but not limited to offenses of driving a commercial motor vehicle in willful or wanton disregard for the safety of persons or property; 3) Improper or erratic traffic lane changes; 4) Following the vehicle ahead too closely; or 5) A violation, arising in connection with a fatal accident, of State or local law relating to motor vehicle traffic control other than a parking violation. (Serious traffic violations exclude vehicle weight and defect violations.)  (49CFR383)

Service Brake: The primary mechanism designed to stop a motor vehicle.  (49CFR571)

Service Brake System: A primary brake system used for slowing and stopping a vehicle.  (49CFR393)

Service Consumed: The amount of service actually used by passengers which is measured by unlinked passenger trips and passenger miles.  (FTA1)

Service Vehicles: The floating and rolling stock used in connection with keeping the revenue vehicles in operation.  (FTA1)

Set: Current or eddies that are not flowing in the natural direction. An opposite current or eddy that tends to counteract the forward movement of a tow or vessel.  (TNDOT1)

Set (Of Current): Deviation from normal current flow, caused by some obstruction such as pier, wall, sandbar, etc. For example, current set above some lock approaches due to flow of water through dam gates.  (TNDOT1)

Set (Tow): A sideways movement of the tow caused by the current or wind. The set of the tow can be very important when the tow meets another tow in close quarters.  (TNDOT1)

Set It Down: To stop quickly.  (ATA1)

Set Over: Movement of a dredge to allow vessels clear passage in a channel. Also, the arrangement of a tow in a lock whereby one barge is moved up abreast of the main body of a tow.  (TNDOT1)

Sevice Supplied: The amount of service actually made available to prospective passengers. Service supplied is measured in vehicles, miles and/or hours that were operated.  (FTA1)

SFA: Single Frequency Approach  (FAA4)

SFAR-38: Special Federal Aviation Regulation 38  (FAA6)

SFO: San Francisco International Airport  (FAA11)

SFO: Simulated Flameout  (FAA4)

SFS: Surface Effect Fast Sea Lift Ship  (MTMC1)

SFST: Standardized Field Sobriety Test  (NHTSA6)

SGRP: Seating Reference Point  (49CFR571)

SHA: State Highway Agency  (MOCD)

Shag: Small, city trailer.  (ATA1)

Shake the Lights: Blinking headlights as a warning signal.  (ATA1)

Shake Up a Reef: To drive the tow at a sufficient speed to create a wake which, when it reaches a suspicious area, will cause the appearance of the reef to show by the turbulence.  (TNDOT1)

Shaping Out Reef or Shore: Channel report term meaning steering tow so as to follow the contour of shore or reef.  (TNDOT1)

Shaping Up: Getting tow in position to run crossing or bridge.  (TNDOT1)

Shared Roadway: Any roadway upon which a bicycle lane is not designated and which may be legally used by bicycles regardless of whether such facility is specifically designated as a bikeway.  (23CFR652)

Sheathing: A covering consisting of a smooth layer of wood placed over metal and secured to prevent any movement.  (49CFR171)

Sheep Herder: Driver with questionable ability.  (ATA1)

Sheer Boom: Same purpose as sheer fence, but a floating structure.  (TNDOT1)

Sheer Fence: A series of pilings with tinted lattice-work attached, extending from bridge piers upstream and downstream to assist the navigator in passing through the narrow bridge spans without damage to the bridge or piers or the vessel. Usually found at bridges that are lift, swing, or bascule types.  (TNDOT1)

SHF: Super High Frequency  (FAA4)

Shifting Bar: A sandbar which moves under the influence of current, usually gradually down river. It may also shift from one side of the river to the other. A sunken log or tree or deep hole in the channel can cause current changes which will build up a bar even above or below the area.  (TNDOT1)

Ship's Manifest: A list, signed by the captain of a ship, of the individual shipments constituting the ship's cargo.  (USTTA1)

Ship's Tackle: All rigging, etc., utilized on a ship to load or discharge cargo.  (TNDOT1)

Shipper's Export Declaration: A form required by the United States government for the compilation of statistics on trade both with foreign countries and with United States territories and possessions. It is necessary on practically every commercial shipment leaving the United States with the exception of mail shipments of small value.  (TNDOT1)

Shipping Paper: A shipping order, bill of lading, manifest or other shipping document serving a similar purpose and containing the information required by 49 CFR 172.202, 172.203, and 172.204.  (49CFR171)

Shipyard: A yard or area where ships are built or repaired.  (DOI4)

Shoal: An area identified as a danger to maritime navigation containing an underwater offshore ridge, bank or bar.  (DOI3)

Shoal: 1) Shallow; 2) To grind a boat on the bottom; 3) A sandbank or sandbar formed by river currents.  (TNDOT1)

Shore: That part of the land in immediate contact with a body of water including the area between high and low water lines.  (DOI4)

Shoreline: The line of contact between a body of water and the land.  (DOI4)

Short Cut: A course different from the customary one taken by a pilot.  (TNDOT1)

Short Ton: A unit of weight equal to 2,000 pounds.  (DOE3)   (DOE5)

Shoulder: An area adjacent to the edge of paved runways, taxiways, or aprons providing a transition between the pavement and the adjacent surface; support for aircraft running off the pavement; enhanced drainage; and blast protection.  (FAA12)

Shoveling: Improper loading of freight.  (ATA1)

SHRP: Strategic Highway Research Program  (FHWA7)   (FHWA8)

SHSA: State Highway Safety Agencies  (NHTSA6)

Shunt: (See also Switch Shunting Circuit) A by-path in an electrical circuit.  (49CFR236)

Shunt Fouling Circuit: (See also Switch Shunting Circuit) The track circuit in the fouling section of a turnout, connected in multiple with the track circuit in the main track.  (49CFR236)

Shunt Wire: A wire forming part of a shunt circuit.  (49CFR236)

Shut In: Closed temporarily; wells and mines capable of production may be shut in for repair, cleaning, inaccessibility to a market, etc.  (DOE5)

Shuttle: A public or private vehicle that travels back and forth over a particular route, especially a short route or one that provides connections between transportation systems, employment centers, etc.  (APTA1)

SI: International System  (FHWA8)

SIAP: Standard Instrument Approach Procedure  (FAA4)

SIC: Standard Industrial Classification  (BTS2)   (DOE3)

Sick Horse: A tractor in poor mechanical condition, especially with low power.  (ATA1)

SID: Standard Instrument Departure  (FAA2)   (FAA17)

Side Collision: A collision at a turnout where one consist strikes the side of another consist.  (FRA2)

Side Extremities: The outermost point on the sides of the vehicle. Nonstructural protrusions such as tail lights, hinges, and latches are excluded from the determination of the outermost point.  (49CFR393)

Side Facing Glazing Location: Any location where a line perpendicular to the plane of the glazing material makes an angle of more than 50 degrees with the centerline of the locomotive, caboose or passenger car.  (49CFR223)

Side Line: Lashing used to hold two barges side by side.  (TNDOT1)

Side Marker Lamp (Intermediate): A lamp shown to the side of a trailer to indicate the approximate middle of a trailer 30 feet or more in length.  (49CFR393)

Side Marker Lamps: Lamps used on each side of a trailer to indicate its overall length.  (49CFR393)

Sideswipe Collision: A collision of two vehicles in which the sides of both vehicles sustain minimal engagements.  (NHTSA3)

Siding: An auxiliary track for meeting or passing trains.  (49CFR236)   (FRA2)

Siding/Spur Railway: Track connected with the primary track, sometimes leading to a production or storage site, and used for passing, temporary storage, or loading and unloading of railway cars.  (DOI3)

Sightseeing Operations: Special service involving the transportation of passengers assembled into a travel group by the carrier and specifically designed to service some special purpose beyond mere public transportation. Such special service is to be distinguished from service which solely contemplates expeditious service between fixed points on a fixed route according to a predetermined schedule.  (FTA1)

SIGMET: Significant Meteorological Information  (FAA4)

Sign: A roadway-associated feature which provides information to people passing.  (DOI4)

Significant Meteorological Convective (SIGMET) Information: A weather advisory concerning convective weather significant to the safety of all aircraft. Convective SIGMETs are issued for tornadoes, lines of thunderstorms, embedded thunderstorms of any intensity level, areas of thunderstorms greater than or equal to level 4 with an area coverage of 4/10 (40%) or more, and hail 3/4 inch or greater.  (FAA4)

Sill: A horizontal beam forming the bottom of an entrance to a lock.  (TNDOT1)

SIM: Schedule of Implementation Procedures  (FAA7)

SIMMOD: Airport and Airspace Simulation Model  (FAA17)

Single: A particular lockage of a tow, used when the tow is too long to enter the lock chamber and must be uncoupled. The towboat, and possibly one other barge, must move up alongside the forward part of the tow to lock through the entire tow at one time or in one lockage.  (TNDOT1)

Single Axle Weight: The total weight transmitted to the road by all wheels whose centers may be included between two parallel transverse vertical planes 40 inches apart, extending across the full width of the vehicle. The Federal single axle weight limit on the Interstate System is 20,000 pounds.  (23CFR658)

Single Packaging: A non-bulk packaging other than a combination packaging.  (49CFR171)

Single Set Over: See Knockout Single.

Single Trailer Five Axle Truck: All five-axle vehicles consisting of two units, one of which is a tractor or straight truck power-unit.  (FHWA2)

Single Trailer Four or Less Axle Truck: All vehicles with four-or-less axles consisting of two units, one of which is a tractor or straight truck power-unit.  (FHWA2)

Single Trailer Six or More Axle Truck: All vehicles with six-or-more axles consisting of two units, one of which is a tractor or straight truck power-unit.  (FHWA2)

Single Unit Four or More Axle Truck: All vehicles on a single frame with four-or-more axles.  (FHWA2)

Single Unit Four Tire Vehicle: All two-axle, four-tire vehicles, other than passenger cars. Included in this classification are pickups, panels, vans and other vehicles such as campers, motor homes, ambulances, hearses, and carryalls. other two-axle, four-tire single-unit vehicles pulling recreational or other light trailers are included in this classification.  (FHWA2)

Single Unit Six Tire Two Axle Truck: All vehicles on a single frame including trucks, camping and recreational vehicles, motor homes, etc., having two axles and dual rear wheels.  (FHWA2)

Single Unit Three Axle Truck: All vehicles on a single frame including trucks, camping and recreational vehicles, motor homes, etc., having three axles.  (FHWA2)

Single Unit Truck: Includes two-axle, four-tire trucks and other single unit trucks.  (DOE6)

Single-Unit Truck: A medium or heavy truck in which the engine, cab, drive train, and cargo area are all one chassis.  (NHTSA3)   (NHTSA4)

Sink/Rise: The place at which a stream disappears underground or reappears at the surface in a karst area.  (DOI3)

Sinking: (See also Swamping) Losing enough buoyancy to settle below the surface of the water.  (USCG2)

Siphon: Designed to convey water by gravitational force over, or under, an obstruction.  (DOI3)

SITC: Standard Industrial Trade Classification  (DoD/COE1)

Six Banger: Six-cylinder engine.  (ATA1)

SJC: San Jose International Airport  (FAA11)

SJU: Luis Munoz Marin International Airport  (FAA11)

Skiff: A small, hand-propelled rowboat. Sometimes called a "yawl."  (TNDOT1)

Skinnie Axle: Six axle trailer.  (ATA1)

Skins: Tires.  (ATA1)

SLC: Salt Lake City International Airport  (FAA11)

SLDI: Sector List Drop Interval  (FAA4)

Sleeper: Truck cab with a sleeping compartment.  (ATA1)

Sleeping Sawyer: A submerged heavy timber hazardous to the vessel.  (TNDOT1)

Slew: See Slough.

Slide: A water borne skid of a tow to momentum and current (encountered downbound only).  (TNDOT1)

Sliding: Uncontrolled sideways movement of vessel.  (TNDOT1)

Slip Line: A line around timberhead so arranged that one end may be released while boat, is backing away from dock.  (TNDOT1)

Slip Resistant Material: Any material designed to minimize the accumulation of grease, ice, mud or other debris and afford protection from accidental slipping.  (49CFR399)

Slip-Seat: Relay operation where drivers are changed periodically, but the truck continues from origin to destination.  (ATA1)

SLOC: Sea Line of Communication  (MTMC1)

Slotted Mechanical Signal: A mechanically operated signal with an electromagnetic device inserted in its operating connection to provide a means of controlling the signal electrically, as well as mechanically.  (49CFR236)

Slough: Generally non-navigable parts of the river where it runs behind islands and away from the channel. (Pronounced "slew").  (TNDOT1)

Slow Speed: A speed not exceeding 20 miles per hour.  (49CFR236)

SLSDC: Saint Lawrence Seaway Development Corporation  (OFR1)

SM: Statute Mile  (FAA17)

Small Air Traffic Hub: A community enplaning from 0.05 to 0.24 percent of the total enplaned passengers in all services and all operations for all Communities within the 50 States, the District of Columbia, and other U.S. areas designated by the Federal Aviation Administration.  (FAA2)   (FAA14)   (FAA15)

Small Aircraft: An aircraft of 12,500 pounds or less maximum certificated takeoff weight.  (14CFR1)

Small Certified Air Carrier: Air carrier holding a certificate issued under section 401 of the Federal Aviation Act of 1958 and operating aircraft designed to have a maximum seating capacity of 60 or less seat or a maximum payload of 18,000 pounds or less.  (FAA2)

Small Urban Area: Places of 5,000 to 49,999 urban population (except in the case of Maine and New Hampshire) outside of urbanized areas. As a minimum the small urban area includes any place containing an urban population of 5,000 or more as designated by the U.S. Bureau of the Census.  (FHWA2)

SMART: State and Metropolitan Analyses of Regional Transportation  (BTS7)

SMD: Service and Methods Demonstration  (Program)   (TRB1)

SMF: Sacramento Metropolitan Airport  (FAA11)

SMGC: Surface Movement Guidance and Control  (FAA17)

SMMC: System Maintenance Monitor Console  (FAA19)

Smoke Him: Pass another vehicle.  (ATA1)

Smoker: Tractor emitting excessive smoke from exhaust.  (ATA1)

Smokestack: Vertical exhaust pipe on side of cab.  (ATA1)

SMPG: Seat Miles Per Gallon  (BTS2)

SMS: Safety Management System  (NHTSA6)

SMS: Simulation Modeling System  (FAA17)

SMSA: Selected Metropolitan Statistical Area  (FHWA13)

SMSA: Standard Metropolitan Statistical Area  (TRB1)

SNA: John Wayne Airport - Orange County  (FAA11)

SNAFU: Situation Normal, All Fouled Up

Snag: A stem or trunk of a tree above the surface of the water.  (DOI4)

Snag/Stump Area: An area identified as a danger to maritime navigation containing one or more trunks or stems near the surface of the water.  (DOI3)

SNG: Substitute Natural Gas  (AGA1)

SNG: Synthetic Natural Gas  (DOE3)

Snowmobile: A motorized vehicle solely designed to operate on snow or ice.  (23CFR652)

SNPRM: Supplemental Notice of Proposed Rulemaking  (NHTSA5)

Snub Nose: See Cab Over.

SO2: Sulfur Dioxide  (BTS2)

SOCRATES: (EC) System of Cellular Radio for Traffic Efficiency and Safety  (FHWA15)

SOIR: Simultaneous Operations On Intersecting Runways  (FAA17)

SOIWR: Simultaneous Operations On Intersecting Wet Runways  (FAA17)

Solar Energy: The radiant energy of the sun, which can be converted into other forms of energy, such as heat or electricity.  (DOE3)   (DOE5)

SOLAS: Safety of Life At Sea Convention  (FHWA12)

Solid: A material which has a vertical flow of two inches (50 mm) or less within a three-minute period, or a separation of less than one gram (18) of liquid when determined in accordance with the procedures specified in American Society for Testing and Materials (ASTM) D 4359, "Standard Test Method for Determining Whether a Material is a Liquid or Solid."  (49CFR171)

Solid Bluff Reef: A shallow reach with deep water below it, not too much current, and in which the sand is pretty well packed.  (TNDOT1)

Solution: Any homogeneous liquid mixture of two or more chemical compounds or elements that will not undergo any segregation under conditions normal to transportation.  (49CFR171)

Sooging: River term used when scrubbing any part of the boat.  (TNDOT1)

Sortie: Action of a unit's resource in rendering assistance, or use of personnel on Communication/Harbor checks. Each action comprises one sortie.  (USCG3)

Sounding Pole: (See also Pike Pole) A pole generally 20 feet long, lightweight, and painted with alternating red, white, and black colors at one foot intervals to permit easy reading of water depths.  (TNDOT1)

SOV: Single Occupancy Vehicle  (MOCD)

SOX: Sulfur Oxide  (BTS8)

Space Vehicle: An artificial body operating in outer space (beyond the earth's atmosphere.)  (AIA1)

Spar Her Out: Usually to hold a boat off bank using a heavy timber.  (TNDOT1)

Spare Parts, Supplies and Other-Net: Flight equipment replacement parts of a type recurrently expended and replaced rather than repaired or reused, supplies such as unissued fuel inventories and unissued materials and supplies held in stock, prepaid items, net investments in direct financing and sales type leases and other current assets. Spare parts may be reduced by an allowance for obsolescence to provide for losses in value.  (BTS4)

Spare Vehicles: The revenue vehicles available to the transit agency to accommodate routine and heavy maintenance requirements, as well as unexpected vehicle breakdowns or accidents, while preserving schedules service operations.  (FTA1)

SPAS: Safety Performance Analysis System  (FAA7)

SPEARS: Screener Proficiency Evaluation and Report System  (FAA1)

SPEARS: Spill Planning Exercise and Response System  (USCG5)

Special Fuels: Consist primarily of diesel fuel with small amount of liquified petroleum gas, as defined by the Federal Highway Administration.  (DOE6)

Special Purpose Terminal: A specialized terminal designed to handle one type of commodity. It is a transfer facility with little or no manufacturing, although it might include lending, separating, and similar processing activities.  (TNDOT1)

Special Purpose Vehicle: A motor vehicle commercially designed for some purpose other than the transportation of personnel, supplies, or equipment. This definition excludes any motor vehicle designed for transport and modified locally as an expedient for meeting special needs; e.g., a pickup with a snowplow blade attached.  (GSA2)

Special Use Airspace: Airspace of defined dimension identified by an area on the surface of the earth wherein activities must be confined because of their nature and/or where limitations may be imposed on aircraft operations that are not a part of those activities.  (FAA8)

Special Use Zone: An area where distinctive types of shipping activities occur.  (DOI3)

Special Vehicle: Consists of the following types of vehicles; snowmobile, farm equipment other than trucks, dune buggy or swamp buggy, construction equipment other than trucks, ambulance, large limousine, self propelled camper and motor home, fire truck, other special vehicles.  (NHTSA1)

Special Visual Flight Rules (VFR) Conditions: Meteorological conditions that are less than those required for basic Visual Flight Rules (VFR) flight in controlled airspace and in which some aircraft are permitted flight under visual flight rules.  (14CFR1)

Special Visual Flight Rules (VFR) Operations: Aircraft operating in accordance with clearances within controlled airspace in meteorological conditions less than the basic Visual Flight Rules (VFR) weather minimum. Such operations must be requested by the pilot and approved by ATC.  (14CFR1)

Special Warehousing and Storage: Establishments primarily engaged in the warehousing and storage of special products, not elsewhere classified, such as household goods, automobiles (dead storage only), furs (for the trade), textiles, whiskey, and goods at foreign trade zones.  (BOC1)

Specialist: The internal individual or group who provides service through the National Air Space (NAS) (e.g., controllers, engineers, maintenance and management personnel).  (FAA8)

Specialized Carrier: A trucking company franchised to transport articles which, because size, shape, weight, or other inherent characteristics, require special equipment for loading, unloading or transporting.  (ATA2)

Specialty Ship (Liquefied Petroleum Gas/Liquefied Natural Gas): A ship designed specifically to carry liquefied gases.  (DOE5)

Specific Acceleration Power: Measured in watts per kilogram. Acceleration power is divided by the battery system weight. Weight must include the total battery system.  (DOE6)

Specific Energy: Measured in watt hours per kilogram. The rated energy capacity of the battery divided by the total battery system weight.  (DOE6)

Specific Public Transportation: Transportation by bus, rail, or any other conveyance (other than aircraft) provided by a private entity to the general public, with general or special service (including charter service) on a regular and continuing basis.  (49CFR37)

Specified Minimum Yield Strength: (See also Stress Level) The minimum yield strength, expressed in pounds per square inch, prescribed by the specification under which the material is purchased from the manufacturer.  (49CFR194)   (49CFR195)

Speed Attainable In 1 Mile: The speed attainable by accelerating at maximum rate from a standing start for 1 mile, on a level surface.  (49CFR571)

Speed Attainable In 2 Miles: The speed attainable by accelerating at maximum rate from a standing start for 2 miles, on a level surface.  (49CFR571)

Speeding: Operating at a speed, possibly below the posted limit, above that which a reasonable and prudent person would operate under the circumstances.  (USCG2)

Spike: One barge that is wired to head of tow that is 2 or 3 barges wide.  (TNDOT1)

Spillway: A constructed passage for surplus water to run over or around a dam.  (DOI3)

Spillway Elevation: The stage of an artificially impounded water body as determined by the spillway.  (DOI3)

Spillway Section of a Dam: That portion of a dam through which water flows; does not permit navigation.  (TNDOT1)

Spin Out: Lose traction on slippery roadway.  (ATA1)

Spine Car: An articulated five-platform railcar.  (MARAD2)

Splitting On the Heads: Term describing the situation when a towboat is faced up to the center of two strings of barges.  (TNDOT1)

SPOD: Sea Port of Debarkation  (MTMC1)

SPOE: Sea Port of Export  (MTMC1)

Sponsor: Any private owner of a public-use airport or any public agency (either individually or jointly with other public agencies) that submit to the Secretary of Transportation, in accordance with the Airport & Airway Improvement Act of 1982, an application for financial assistance.  (FAA2)

Sponsor: The administrating body for the airport, such as a State or local government or municipal authority.  (FAA11)

Spoonbill Barge: A 50 foot wide barge with a very long rake, usually about 60 feet.  (TNDOT1)

Sport-Utility Vehicle: Includes light trucks that are similar to jeeps. Other common terms for these vehicles are sport-utility, special purpose, utility or off-the-road vehicles. They may have a four or two-wheel drive. Previously called Jeep-Like Vehicle.  (DOE4)

Spot Market: Buying and selling of fuel for immediate or very near-term delivery by contracts to meet peak demands.  (DOE5)

Spot the Body: Part of a trailer.  (ATA1)

Spotter: (See also Yardbird) Terminal yard driver who parks vehicles brought in by regular drivers, also a supervisor who observes the activities of drivers on the road.  (ATA1)

SPR: Strategic Petroleum Reserve  (DOE3)   (MARAD4)

Spring: A place where water issues from the ground naturally.  (DOI4)

Spring Line: A line to hold boat from running upstream. Used in mooring, crossing one another. Also called "backing line".  (TNDOT1)

Spring Switch: A switch equipped with a spring device which forces the points to their original position after being trailed through and holds them under spring compression.  (49CFR236)

SPS: Specific Pavement Studies  (FHWA7)

Spud: The heavy timber or pipe extending vertically through a well in the bottom of the boat used for mooring in lieu of anchors on riverboats.  (TNDOT1)

Spud Barge: A barge utilizing spuds for mooring. Used as a work barge or loading and unloading platform.  (TNDOT1)

Squealer: Also known as "tattle tale" whose proper name is tachograph. A device used in a cab to automatically record miles driven, number of stops, speed and other factors during a trip.  (ATA1)

SRA: Ship Repair Agreement  (MARAD4)

SRA: Short Range Aids  (USCG5)

SRO: Standing Route Order  (MTMC1)

SRQ: Sarasota / Bradenton International Airport  (FAA11)

SRT: Standard Remote Terminal  (MTMC1)

SSALF: Simplified Short Approach Light System With Sequenced Flashing Lights  (FAA4)

SSALR: Simplified Short Approach Light System With Rail  (FAA4)

SSR: Secondary Surveillance Radar  (FAA7)   (FAA19)

SSVS: Super Smart Vehicle System  (FHWA15)

STA: Strategic Transportation Analysis  (MTMC1)

STAA: Surface Transportation Assistance Act  (FHWA8)

Stabilized Channel: A channel which remains in one location permanently with no maintenance.  (TNDOT1)

STAC: Standard Traffic Agents Code  (MTMC1)

Stack: Exhaust pipe on diesel.  (ATA1)

Stack Car: An articulated five-platform rail car that allows containers to be double stacked.  (MARAD2)

Stacktrain: A rail service whereby rail cars carry containers stacked two-high on specially-operated unit trains.  (MARAD2)

STADSS: Strategic Transportation Analysis Decision Support System  (MTMC1)

Stage 2 Aircraft: An aircraft that has been shown to comply with the stage 2 noise requirements under Federal Aviation Regulation (FAR) Part 36. (Examples include the B-727-200, DC-9, and BAC-111.)  (FAA3)

Stage 3 Aircraft: An aircraft that has been shown to comply with the quieter Stage 3 noise requirements under Federal Aviation Regulation (FAR) Part 36 (Examples include the B-737-300, B-757, MD-80, and A- 310.)  (FAA3)

Stake Body: Truck or trailer platform body with readily removable stakes, which may be joined by chains, slats, or panels.  (ATA1)

Standard: Prescribes design constraints or performance requirements for boats and/or associated equipment. May be either a regulation or may be voluntary.  (USCG1)

Standard Barge: A barge which is approximately 26 feet wide and 175 feet long and either open or covered.  (TNDOT1)

Standard Body: A body type normally furnished as a standard option by the original equipment (chassis) manufacturer (e.g., pick-up, panel, and flat bed).  (GSA2)

Standard Design Vehicle: A vehicle procurable from regular production lines. Included in this category are commercial design vehicles modified for special purpose use, if the modifications have not altered the basic design characteristics of the vehicle.  (GSA2)

Standard Industrial Classification (SIC): A set of codes developed by the Office of Management and Budget which categorizes industries into groups with similar economic activities.  (DOE3)

Standard Instrument Department (SID) Charts: Designed to expedite clearance delivery and to facilitate transition between takeoff and en route operations. Each SID procedure is presented as a separate chart and may serve a single airport or more than one airport in a given geographical location.  (FAA4)

Standard Labor Rate: A rate calculated to approximate the total per hour cost of salaries and related fringe benefits for application against labor hours in pricing job orders.  (GSA2)

Standard Metropolitan Statistical Area: (See also Central City, Metropolitan Statistical Area) A county that contains at least one city of 50,000 population, or twin cities with a combined population of at least 50,000, plus any contiguous counties that are metropolitan in character and have similar economic and social relationships.  (FAA4)   (FAA15)

Standard Railway Gauge: Distance between the rails of a track of 4 ft 8.5 inches.  (DOI3)

Standard Size Bus: A bus from 35 to 41 feet in length.  (APTA1)

Standard Terminal Arrival (STAR) Route Charts: Designed to expedite air traffic control arrival procedures and to facilitate transition between en route and instrument approach operations. Each STAR procedure is presented as a separate chart and may serve a single airport or more than one airport in a given geographical location.  (FAA4)

Standing Capacity: The number of standing passengers that can be accomodated aboard the revenue vehicle during a normal full load (non-crush) in accordance with established loading policy or, in absence of a policy, the manufacturer's rated standing capacity figures.  (FTA1)

Standout: Term used when the channel runs down the shape of shore and there is an obstruction along the set of marks running out into the middle of the river, thus requiring a temporary change of course to clear.  (TNDOT1)

STAR: Standard Terminal Arrival Route  (FAA2)   (FAA4)   (FAA17)

Starboard: The right side of a ship when facing the bow.  (MARAD2)

STARS: Ship Tracking and Retrieval System  (MARAD4)

STARS: Standard Terminal Automation Replacement System  (FAA19)

STAS: Strategic Transportation Analysis System  (MTMC1)

STATCO: Statistical Passenger Data Collection System  (MTMC1)

State: A state of the United States, the District of Columbia, the Commonwealth of Puerto Rico, the Commonwealth of the Northern Mariana Islands, the Virgin Islands, American Samoa, Guam, or any other territory or possession of the United States designated by the Secretary [of Transportation].  (49CFR171)

State: A state of the United States and the District of Columbia.  (49CFR383)

State of Domicile: That state where a person has his/her true, fixed, and permanent home and principal residence and to which he/she has the intention of returning whenever he/she is absent.  (49CFR383)

State Routing Agency: An entity (including a common agency of more than one state such as one established by Interstate compact) which is authorized to use state legal process pursuant to 49 CFR 177.825 to impose routing requirements, enforceable by State agencies, on carriers of radioactive materials without regard to intrastate jurisdictional boundaries. This term also includes Indian tribal authorities which have police powers to regulate and enforce highway routing requirements within their lands.  (49CFR171)

State Transportation Agency: The State highway department, transportation department, or other State transportation agency to which Federal-aid highway funds are apportioned.  (23CFR420)

State-Designated Route: A preferred route selected in accordance with U.S. DOT "Guidelines for Selecting Preferred Highway Routes for Highway Route Controlled Quantities of Radioactive Materials" or an equivalent routing analysis which adequately considers overall risk to the public.  (49CFR171)

Static Loaded Radius Arc: A portion of a circle whose center is the center of a standard tire-rim combination of an automobile and whose radius is the distance from that center to the level surface on which the automobile is standing, measured with the automobile at curb weight, the wheel parallel to the vehicle's longitudinal centerline, and the tire inflated to the manufacturer's recommended pressure.  (49CFR523)

Station: With respect to intercity and commuter rail transportation, the portion of a property located appurtenant to a right of way on which intercity or commuter rail transportation is operated, where such portion is used by the general public and is related to the provision of such transportation, including passenger platforms, designated waiting areas, rest rooms and, where a public entity providing rail transportation owns the property, concession areas, to the extent that such public entity exercises control over the selection, design, construction, or alteration of the property, but this term does not include flag stops (i.e., stations which are not regularly scheduled stops but at which trains will stop to board or detrain passengers only on signal or advance notice).  (49CFR37)

STCC: Standard Transportation Commodity Classification  (BTS2)   (MTMC1)

STDM: Statistical Time Division Multiplexing  (FAA19)

Steamboat Gothic: An elaborately ornamental architectural style that is an imitation of river steamboats of the middle 19th century on the Ohio and Mississippi rivers.  (TNDOT1)

Steamboat Jack: Colloquial term for an oversized turnbuckle with large pelican hooks on each end and a ratchet (handle) around the body used for tightening wire lashings and making up tows. Used to connect barges in tow.  (TNDOT1)

Steamship Agent: A duly appointed and authorized representative in a specified territory acting in behalf of a steamship line or lines and attending to all matters relating to the vessels owned by his principals.  (TNDOT1)

Steamship Conference: Collective rate-making bodies for liner water carriers that serve the same trade route.  (MARAD1)

Steel Hull: Hulls of sheet steel or steel alloy, not those with steel ribs and wood, canvas or plastic hull coverings.  (USCG2)

Steel Tower: A skeleton steel tower type of structure used for lighted shore aids; used in multiples of 10-foot sections.  (TNDOT1)

Steel Wheel: In rail systems, the specially designed cast or forged steel, essentially cylindrical element that rolls on the rail, carries the weight, and provides guidance for rail vehicles. The wheels are semipermanently mounted in pairs on steel axles and are designed with flanges and a tapered treat to provide for operation on track of a specific gauge. The wheel also serves as a brake drum on cars with on-tread brakes.  (TRB1)

Steer It: To navigate a portion of the river without flanking maneuver.  (TNDOT1)

Steering Wheel Lash: The condition in which the steering wheel may be turned through some part of a revolution without associated movement of the front wheels.  (49CFR393)

Stem Winder: Hand-crank starter.  (ATA1)

STEP: Service Test and Evaluation Program  (FAA19)

Stern: The end of a vessel, opposite of bow.  (MARAD2)

Stern Line: Long quartering line.  (TNDOT1)

Stern Line Talk: Supposedly factual information about anything, passed between river people, usually by a lockman chatting with deck hands handling lines during lockage.  (TNDOT1)

Stevedore: A person or firm that contracts with a vessel's owner, agent or charter operator, or with the owner of the cargo, to load or unload a ship or barge in port.  (MARAD1)

Stevedore: One who works at or is responsible for loading and unloading ships in a port.  (TNDOT1)

Stilling Basin: A structure at the outlet end of a spillway to help dissipate the energy of flowing water into the downstream channel in such a manner as to prevent damage to the dam or scour of the bed or banks of the channel.  (TNDOT1)

Stinger-Steered Combination: A truck tractor semitrailer wherein the fifth wheel is located on a drop frame located behind and below the rear-most axle of the power unit.  (23CFR658)

STIP: Statewide Transportation Improvements Program  (MOCD)

STL: Lambert - St Louis International Airport  (FAA11)

STLD: Surface Transport Loading Data  (MTMC1)

Stockholder's Equity: The aggregate interest of holders of the air carrier's stock in assets owned by the air carrier.  (BTS4)

Stockyard: An enclosed area in which livestock are temporarily kept.  (DOI4)

STOL: Short Takeoff and Landing  (AIA1)   (BTS8)   (FAA2)

Stolport: An airport specifically designed for Short Take-off and Landing (STOL) aircraft, separate from conventional airport facilities.  (FAA2)

Stop: As applied to mechanical locking, a device secured to a locking bar to limit its movement.  (49CFR236)

Stop Lamps: Lamps shown to the rear of a motor vehicle to indicate that the service brake system is engaged.  (49CFR393)

Stop-Indication Point: As applied to an automatic train stop or train control system without the use of roadway signals, a point where a signal displaying an aspect requiring a stop would be located.  (49CFR236)

Stopping Distance: The maximum distance on any portion of any railroad which any train operating on such portion of railroad at its maximum authorized speed, will travel during a full service application of the brakes, between the point where such application is initiated and the point where the train comes to a stop.  (49CFR236)

Stopway: A defined rectangular surface beyond the end of a runway prepared or suitable for use in lieu of runway to support an airplane, without causing structural damage to the airplane, during an aborted takeoff.  (FAA12)

Storage Tank: A container for storing a hazardous fluid, including an underground cavern.  (49CFR193)

Stowage: The act of placing hazardous materials on board a vessel.  (49CFR171)

STP: Surface Transportation Program  (MOCD)

STPP: Surface Transportation Policy Project  (ENO1)

STRACNET: Strategic Rail Corridor Network  (MTMC1)

STRAHNET: Strategic Highway Corridor Network  (BTS2)   (MTMC1)

Straight Truck: Vehicle with the cargo body and tractor mounted on the same chassis.  (ATA2)

Strategic Communications: Air Traffic Management (ATM) communications that are planned as much as a day or more in advance of delivery.  (FAA7)

Strategic Petroleum Reserve (SPR): Petroleum stocks maintained by the Federal Government for use during periods of major supply interruption.  (DOE3)   (DOE5)

Stray: A buoy adrift from its proper station. Strays may often be lodged in and amongst dikes, etc. Stray buoys can be particularly confusing in the rays of a searchlight at night.  (TNDOT1)

Stream/River: A body of flowing water.  (DOI3)

Streetcar: Another name for "light rail."  (APTA1)

Streetcar: An electrically powered rail car that is operated singly or in short trains in mixed traffic on track in city streets.  (TRB1)

Streetcar/Trolley: Includes trolleys, streetcars, and cable cars.  (FHWA3)

Stress Level: (See also Specified Minimum Yield Strength) The level of tangential or hoop stress, usually expressed as a percentage of specified minimum yield strength.  (49CFR194)   (49CFR195)

String Out: See Mule Train.

Strip Her: Unloading the trailer.  (ATA1)

Stroke: The distance traveled by a piston in a cylinder during 1/2 revolution of the crankshaft.  (TII1)   (TII2)

Strong Outside Container: The outermost enclosure which provides protection against the unintentional release of its contents under conditions normally incident to transportation.  (49CFR171)

STRS: Strategic Transportation Research Study  (FHWA7)

Struck By Boat or Propeller: Striking of a victim who is outside of the boat, but not necessarily a swimmer.  (USCG2)

STT: Cyril E King Airport  (FAA11)

Student Pilot: A student pilot may not operate an aircraft that is carrying a passenger or that is carrying property for compensation or hire.  (FAA2)

STURAA: Surface Transportation and Uniform Relocation Assistance Act - 1987  (MTMC1)

SUA: Special Use Airspace  (FAA17)

Submerged Stream: An old river course inundated by an impounded water body.  (DOI3)

Subregional Port: Waterfront area which 1) Has place identity, by reason of association with an adjacent or nearby town or city; 2) Has at least three commercial terminals located within a reasonable distance of the general area; and 3) Is served by a major railroad and at least one major interstate or U.S. highway.  (TNDOT1)

Subscribed and Unissued Stock: The par or stated value, or the subscription price in the case of stock without par or stated value, of legally enforceable subscriptions to the capital stock of the air carrier.  (BTS4)

Subscription Bus: A commuter bus express service operated for a guaranteed number of patrons from a given area on a prepaid, reserved basis.  (APTA1)

Subsidy: Revenues received from the United States Government for the performance of guaranteed essential air service to small communities and for losses incurred in forced service. Does not include revenues from the carriage of mail at service rates or the performance of other contractual services for the Government.  (BTS4)

Substantial Damage: As stated in 49CFR 830.2, damage or structural failure which adversely affects the structural strength, performance, or flight characteristics of the aircraft, and which would normally require major repair or replacement of the affected component. This does not include engine failure, damage limited to an engine, bent fairings or cowling, dented skin, small punctured holes in the skin of the fabric, ground damage to rotor or propeller blades, damage to landing gear, wheels, tires, flaps, engine accessories, brakes, or wingtips.  (NTSB1)   (NTSB2)

Suburban Bus: A bus with front doors only, normally with high-backed seats, and without luggage compartments or restroom facilities for use in longer-distance service with relatively few stops.  (APTA1)

Suburban Rail: Another name for "commuter rail."  (APTA1)

Subway: 1) That portion of a transportation system that is constructed beneath the ground surface, regardless of its method of construction. 2) An underground rail rapid transit system or the tunnel through which it runs. 3) In local usage, sometimes used for the entire rail rapid transit system, even if it is not all beneath the ground surface. 4) A pedestrian underpass.  (TRB1)

Subway - Tunnel/Tube: Rail transit way below surface with a cover over the tunnel. Cut and cover, bored tunnel, underwater tubes, etc., are included.  (FTA1)

Sucker Brakes: Vacuum brakes.  (ATA1)

Suicide: A person ending his or her own life intentionally. This is a subset of Collision with People.  (FTA2)

Summerstock: Operation Summerstock has been a major program over the past fifteen years where Search and Rescue stations in the Ninth District are augmented by Reserve personnel during the busy summer SAR season.  (USCG3)

SUP: Sailor's Union of the Pacific  (MARAD4)

SUPDOC: Superintendent of Documents - Government Printing Office

Superiority of Trains: The precedence conferred upon one train over other trains by train order or by reason of its class or the direction of its movement.  (49CFR236)

Supplemental Air Carrier: 1) An air carrier holding a certificate issued under section 401(d)(3) of the Federal Aviation Act, or a special operating authorization issued under section 417 of the Act. 2) One of a class of air carriers now holding Certificates of Public Convenience and Necessity issued by the Department of Transportation, authorizing them to perform passenger and cargo charter services supplementing the scheduled service of the certificated route air carriers. Both international and domestic charter operations are for a temporary period. The authority of supplemental air carriers to engage in military charters is of an indefinite period. In addition, they can perform on an emergency basis, as may be authorized by the Department of Transportation, scheduled operations including the transportation of individually ticketed passengers and individually waybilled cargo.  (FAA2)   (FAA9)   (DOE6)

Supplemental Air Carrier: An air carrier certificated in accordance with FAR Part 121, and providing nonscheduled or supplemental carriage of passengers or cargo, or both, in air transportation. Also referred to as nonscheduled or charter air carriers.  (FAA14)

Supplies and Other Net Spare Parts: Flight equipment replacement parts of a type recurrently expended and replaced rather than repaired or reused, supplies such as unissued fuel inventories and unissued materials and supplies held in stock, prepaid items, net investments in direct financing and sales type leases and other current assets. Spare parts may be reduced by an allowance for obsolescence to provide for losses in value.  (BTS4)

Surface Rights: Fee ownership in surface areas of land. Also used to describe a lessee's right to use as much of the surface of the land as may be reasonably necessary for the conduct of operations under the lease.  (DOE5)

Surge Pressure: Pressure produced by a change in velocity of the moving stream that results from shutting down a pump station or pumping unit, closure of a valve, or any other blockage of the moving stream.  (49CFR195)

Surplus: Any excess personal property not required for the needs and the discharge of the responsibilities of any Federal agency, as determined by the Administrator of General Services.  (GSA2)

Surplus Energy: Energy generated that is beyond the immediate needs of the producing system. This energy may be supplied by spinning reserve and sold on an interruptible basis.  (DOE5)

Surveillance: The detection, location, and tracking of aircraft within National Airspace System (NAS) airspace for the purposes of control, separation, and identification. Surveillance systems are electronic in nature; visual methods are purposely excluded. In the case of dependent surveillance, the aircraft provides all flight information. Surveillance systems are differentiated as independent, independent cooperative, and dependent.  (FAA8)

SVFR: Special Visual Flight Rules  (FAA14)   (FAA13)

SVRC: Short-range Vehicle to Roadside Communication  (FHWAII)

SWAK: Sealed With A Kiss

Swamper: A helper who rides with driver.  (ATA1)

Swamping: (See also Sinking) Filling with water, particularly over the side, but retaining sufficient buoyancy to remain on the surface.  (USCG2)

Swash: The mass of broken foaming water which rushes bodily up a beach as a wave breaks.  (DOI4)

Swindle Sheet: Interstate Commerce Commission (ICC) log.  (ATA1)

Swing Dog: A locking dog mounted in such a manner that it is free to rotate on a trunnion which is riveted to a locking bar.  (49CFR236)

Switch Circuit Controller: A device for opening and closing electric circuits, operated by a rod connected to a switch, derail or movable-point frog.  (49CFR236)

Switch In: To remove barges from the main tow and move them into an unloading or fleeting area. The switching is done by the switching tug.  (TNDOT1)

Switch Out: To move barges from the unloading or fleeting area to the main tow.  (TNDOT1)

Switch Providing Access: A switch which if traversed by rolling equipment could permit that rolling equipment to couple to the equipment being protected.  (49CFR218)

Switch Shunting Circuit: (See also Shunt, Shunt Fouling Circuit) A shunting circuit which is closed through contacts of a switch circuit controller.  (49CFR236)

Switch-and-Lock Movement: A device, the complete operation of which performs the three functions of unlocking, operating and locking a switch, movable-point frog or derail.  (49CFR236)

Switching and Terminal Railroad: A company primarily performing switching service, furnishing terminal trackage, bridges, or other facilities such as union freight stations, operating ferries, or performing any one or combination of these functions. It may coincidentally conduct a regular freight or passenger service.  (AAR1)

Switching Boat: Tug used to move barges between the loading or fleeting area and the main tow. Usually has about 1350 horsepower.  (TNDOT1)

Switching Service: A railway service performed under yard rules and regulations. It may involve the classification of cars according to commodity and destination; the assembling of cars for train movement; changing the position of cars for purposes of loading, unloading, and weighing; the placing of locomotives and cars for repair and storage; and the moving of equipment in connection with the carrier's work service not constituting a road movement.  (AAR1)

SWSL: Supplemental Weather Service Location  (FAA4)

Synchromesh Transmission: A transmission with mechanisms for matching up the gear speeds so that they can be shifted without clashing, eliminating need for double clutching.  (TII1)   (TII2)

SYR: Syracuse Hancock International Airport  (FAA11)

System: Total operations of a carrier or carrier grouping including both domestic and international operations.  (BTS5)   (BTS6)

System Planning: Also known as integrated airport system planning it is the initial, as well as continuing development for planning purposes of information and guidance to determine the extent, type, nature, location, and timing of airport development needed in a specific area to establish a viable balanced, and integrated system of public-use airports.  (FAA2)

System Security: All activities associated with providing security to transit patrons and securing transit property including supervision and clerical support. Includes patrolling revenue vehicles and passenger facilities during revenue operations; patrolling and controlling access to yards, buildings and structures; monitoring security devices; and, reporting security breaches.  (FTA1)