Search Results - R (345 entries)

RAA: Regional Airline Association  (FAA7)

Radar Air Traffic Control Facility (RATCF): An air traffic control facility, located at a U.S. Naval or Marine Corps Air Station, utilizing surveillance, and normally, precision approach radar and air/ground communication equipment to provide approach control services to aircraft arriving, departing or transiting the airspace controlled by the facility. The facility may be operated by the Federal Aviation Administration (FAA), the United Sates Navy (USN), the United States Marine Corp (USMC), or the FAA & USN and service may be provided for both civil and military airports.  (FAA13)   (FAA14)

Radar Air Traffic Control Tower: An airport traffic control tower that uses radar and nonradar capabilities to provide approach control services to aircraft arriving, departing, or transiting airspace controlled by the facility. It provides radar air traffic control services to aircraft operating in the vicinity of one or more civil and/or military airports in the terminal area.  (FAA13)

Radar Altimeter: Aircraft instrument that makes use of the reflection of radio waves from the ground to determine the height of the aircraft above the surface.  (FAA6)

Radar Approach Control (RAPCON): An air traffic control facility, located at a U.S. Air Force (USAF) base, utilizing surveillance and, normally, precision approach radar and air/ground communication equipment to provide approach control services to aircraft arriving, departing, and transiting the airspace controlled by the facility. The facility may be operated by the Federal Aviation Administration (FAA), or the United States Air Force (USAF). Service may be provided to both civil and military airports.  (FAA13)   (FAA14)

Radar Approach Control Tower: An airport traffic control tower (ATCT) that uses radar and non-radar capabilities to provide approach control services to aircraft arriving, departing, or transiting airspace controlled by the facility. It provides radar Air Traffic Control (ATC) services to aircraft operating in the vicinity of one or more civil and/or military airports in the terminal area In other words, a radar approach control tower is an ATCT at which airport traffic control specialists are permitted to provide radar approach control service, including extensive vectoring, as well as to handle takeoffs and landings. Radar Acts can be separated into a control tower and a radar room.  (FAA10)

Radar Dome: A dome-shaped structure used to protect the antenna of a radar installation.  (DOI4)

Radar Reflector: A device capable of or intended for reflecting radar signals.  (DOI4)

Radio Contact: The initial radio call-up to a flight service station by en route aircraft, which includes a complete interchange of information and a termination of the contact.  (FAA13)   (FAA14)

RADNAV: Radio Navigation  (USCG5)

Rag Top: Open top trailer covered with a tarpaulin.  (ATA1)

Rags: Bad tires.  (ATA1)

Rail: See also Locomotive, Railway, Railroad, Train.

RAIL: Runway Alignment Indicator Lights  (FAA4)   (FAA17)

Rail: A rolled steel shape laid in two parallel lines to form a track for carrying vehicles with flanged steel wheels.  (TRB1)

Rail Car: (See also Railway Car) A car designed to carry freight or non-passenger personnel by rail, and includes a box car, flat car, gondola car, hopper car, tank car, and occupied caboose.  (49CFR171)

Rail Joint Bond: A metallic connection attached to adjoining rails to insure electrical conductivity.  (49CFR236)

Rail Mode: (See also Rapid Rail, Rapid Transit Rail, Transit Mode, Transit Railroad, Transit Railway) Consists of freight and passenger (including commuter) railroads.  (BTS1)

Rail-Highway Grade Crossing: (See also Grade Crossings; Highway-Rail Crossing) A location where one or more railroad tracks cross a public highway, road, or street or a private roadway, and includes sidewalks and pathways at or associated with the crossing.  (49CFR225)

Railbus: A relatively light, diesel-powered, two-axle rail vehicle with a body resembling that of a bus.  (TRB1)

Railroad: See also Locomotive, Rail, Railway, Train.

Railroad: A person engaged in transportation by rail.  (49CFR171)

Railroad: All forms of non-highway ground transportation that run on rails or electro-magnetic guideways, including; 1) Commuter or other short-haul rail passenger service in a metropolitan or suburban area, and 2) High speed ground transportation systems that connect metropolitan areas, without regard to whether they use new technologies not associated with traditional railroads. Such term does not include rapid transit operations within an urban area that are not connected to the general railroad system of transportation.  (49CFR225)   (49CFR229)   (49CFR245)

Railroad: Any surface transportation system that carries passengers, goods, materials, or property over rails.  (FRA3)

Railroad Accident: An event arising from the operation of a railroad which, with minor exceptions results in one or more of the following circumstances 1) Any impact between railroad on-track equipment and an automobile, bus, truck, motorcycle, bicycle, farm vehicle, pedestrian, or other highway user at a highway-rail crossing; 2) Any collision, derailment, fire, explosion, act of God, or other event involving the operation of railroad on-track equipment, standing or moving, which results in more than $6,300 in damages to railroad on-track equipment, signals, track, track structures, and roadbeds; 3) Any event arising from the operation of a railroad which results in the death of one or more persons; an injury to one or more persons (other than railroad employees) requiring medical treatment; 4) An injury to one or more employees which requires medical treatment; or results in restriction of work or motion for one or more days, or one or more lost work days, transfer to another job, termination of employment, loss of consciousness or any occupational illness of a railroad employee as diagnosed by a physician.  (FRA1)

Railroad and Railway Electric Service: Electricity supplied to railroads and interurban and street railways, for general railroad use, including the propulsion of cars or locomotives, where such electricity is supplied under separate and distinct rate schedules.  (DOE5)

Railroad Car Mile: A single railroad car moved a distance of one mile.  (DOE6)

Railroad Crossing Collision: A collision between on-track railroad equipment at a point where tracks intersect.  (FRA2)

Railroad Switching and Terminal: 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)

Railroad Switching and Terminal Establishments: Establishments primarily engaged in the furnishings of terminal facilities for rail passenger or freight traffic for line-haul service, and in the movement of railroad cars between terminal yards, industrial sidings, etc. Terminal companies do not necessarily operate any vehicles themselves, but may operate the stations and terminals.  (BOC1)

Railroaded: See Tow.

Railway: See also Locomotive, Rail, Railroad, Train.

Railway: A permanent way having one or more rails which provides a track for trains.  (DOI4)

Railway Car: (See also Rail Car) A railway car designed to carry freight, railroad personnel, or passengers. This includes boxcars, covered hopper cars, flatcars, refrigerator cars, gondola cars, hopper cars, tanker cars, cabooses, stock cars, ventilation cars, and special cars. It also includes on-track maintenance equipment.  (FRA1)

Railway Gauge: Distance between the rails of a track.  (DOI3)

Railway Yard: An area provided with a system of tracks and associated structures, where railway trains are assembled, and railway cars are switched, stored or serviced.  (DOI3)   (DOI4)

RAIRS: Railroad Accident / Incident Reporting System  (BTS7)

Raking Collision: A collision between parts or a consist on an adjacent track, or with a structure such as a bridge.  (FRA2)

Ramp: An inclined roadway connecting roads of differing levels.  (DOI3)

Ramp Metering: The process of facilitating traffic flow on freeways by regulating the amount of traffic entering the freeway through the use of control devices on entrance ramps. 2) The procedure of equipping a freeway approach ramp with a metering device and traffic signal that allow the vehicles to enter the freeway at a predetermined rate.  (TRB1)

Ranking Crew Member: An individual in whom the general charge of the train or yard crew is vested in accordance with the railroad's operating rules. Unless otherwise designated by the railroad, the ranking crew member will be the assigned locomotive engineer.  (49CFR218)

RAPCON: Radar Approach Control  (FAA19)   (FAA14)   (FAA13)

Rapid Rail: (See also Rail Mode, Rapid Transit Rail, Transit Mode, Transit Railroad, Transit Railway) A subway-type transit vehicle railway operated on exclusive private rights of way with high level platform stations. Rapid rail also may operate on elevated or at grade level track separated from other traffic.  (49CFR37)

Rapid Transit: Rail or motorbus transit service operating completely separate from all modes of transportation on an exclusive right-of-way.  (APTA1)

Rapid Transit Rail: (See also Rail Mode, Rapid Rail, Transit Mode, Transit Railroad, Transit Railway) Transit service using rail cars driven by electricity usually drawn from a third rail, configured for passenger traffic and usually operated on exclusive rights-of-way. It generally uses longer trains and has longer station spacing than light rail.  (FTA1)

Rapids: An area of broken, fast flowing water in a stream, where the slope of the bed increases (but without a prominent break of slope which might result in a waterfall), or where a gently dipping bar of harder rock outcrops.  (DOI4)

RATCF: Radar Air Traffic Control Facilities  (FAA14)   (FAA13)

Ratchet: A heavy turnbuckle with course-screw threads and midships handle, equipped with pelican hooks on both ends for the purpose of rapidly tightening up wire lashings holding the barges of a tow together. It is widely used on the rivers.  (TNDOT1)

Rate-Regulated Pipelines: The pipelines included in these segments are all Federally or state rate-regulated pipeline operations, which are included in the reporting company's consolidated financial statements. However, at the reporting company's option, intrastate pipeline operations may be included in the U.S. Refining/Marketing Segment if: 1) They would comprise less than 5 percent of U.S. Refining/Marketing Segment net property plant & equipment (PP&E), revenues,and earnings in the aggregate; and 2) If the inclusion of such pipelines in the consolidated financial statements adds less than $100 million to the net PP&E reported for the U.S. Refining/Marketing Segment.  (DOE5)

Rated Maximum Continuous Augmented Thrust: With respect to turbojet engine type certification, means the approved jet thrust that is developed statically or in flight, in standard atmosphere at a specified altitude, with fluid injection or with the burning of fuel in a separate combustion chamber, within the engine operating limitations established under Part 33 of this chapter, and approved for unrestricted periods of use.  (14CFR1)

Rated Maximum Continuous Thrust: With respect to turbojet engine type certification, means the approved jet thrust that is developed statically or in flight, in standard atmosphere at a specified altitude, without fluid injection and without the burning of fuel in a separate combustion chamber, within the engine operating limitations established under Part 33 of this chapter, and approved for unrestricted periods of use.  (14CFR1)

Rated Takeoff Augmented Thrust: With respect to turbojet engine type certification, means the approved jet thrust that is developed statically under standard sea level conditions, with fluid injection or with the burning of fuel in a separate combustion chamber, within the engine operating limitations established under Part 33 of this chapter, and limited in use to periods of not over 5 minutes for takeoff operation.  (14CFR1)

Rated Takeoff Thrust: With respect to turbojet engine type certification, means the approved jet thrust that is developed statically under standard sea level conditions, without fluid injection and without the burning of fuel in a separate combustion chamber within the engine operating limitations established under Part 33 of this chapter, and limited in use to periods of not over 5 minutes for takeoff operation.  (14CFR1)

Rating: A statement that, as a part of a certificate, sets forth special conditions, privileges, or limitations.  (14CFR1)

Ratio Estimate: (See also Estimate Ratio, Mean) The ratio of two population aggregates (totals). For example, "average miles traveled per vehicle" is the ratio of total miles driven by all vehicles, over the total number of vehicles.  (DOE4)

RBI: Runs Batted In

RBN: Radio Beacon  (14CFR1)

RBS: Recreational Boating Safety  (USCG5)

RC: Road Reconnaissance  (FAA4)

RCAG: Remote Communications Air/Ground Facility  (FAA4)

RCC: Regulation Communication Center  (RSPA1)

RCC: Rescue Coordination Center  (FAA8)

RCE: Radio Control Equipment  (FAA19)

RCF: Remote Communication Facility  (FAA19)

RCI: Roadway Congestion Index  (BTS2)

RCL: Radio Communications Link  (FAA19)

RCLS: Runway Centerline Light System  (FAA16)

RCO: Remote Communications Outlet  (FAA19)

RCR: Runway Condition Reading  (FAA4)

RCRA: Resource Conservation and Recovery Act  (BTS8)

RDMC: Regional Director of Motor Carriers  (FHWA10)

RDSIM: Runway Delay Simulation Model  (FAA17)

RDTE: Research Development Test and Evaluation  (AIA1)

RDU: Raleigh - Durham International Airport  (FAA11)

Reach: A certain area of a river, usually a straight section.  (TNDOT1)

Read the Water: To navigate by visual observation of the water surface; not recommended for newcomers.  (TNDOT1)

Rear Axle Capacity: The factor and/or Society of Automotive Engineers (SAE) recommended maximum load that a rear axle assembly is designed to carry as rated at the ground and expressed in pounds.  (GSA2)

Rear End Collision: 1) A collision in which one vehicle collides with the rear of another vehicle. 2) A collision in which the trains or locomotives involved are traveling in the same direction on the same track. 3) A collision of the front of one vehicle with the rear of another vehicle. Also called rear-end.  (FRA2)   (NHTSA3)

Rear Extremity: The rearmost point on a vehicle when the vehicle's cargo doors, tailgate or other permanent structure are positioned as they normally are when the vehicle is being driven. Non-structural protrusions such as tail lights, hinges, an latches are deleted from the determination of the rearmost point.  (49CFR393)

Rear Overhang: Distance from the center of the rear axle to the end of frame.  (TII1)   (TII2)

Rearrange Tow: To shift barges in tow.  (TNDOT1)

Rebuild: (See also Remanufactured Vehicle) A complete repair of a component with the objective of returning it as nearly as possible to its original and/or performance characteristics.  (GSA2)

Rebuilt Caboose: A caboose that has undergone overhaul which has been identified by the railroad as a capital expense under Interstate Commerce Commission accounting standards.  (49CFR223)

Rebuilt Locomotive: A locomotive that has undergone overhaul which has been identified by the railroad as a capital expense under Interstate Commerce Commission accounting standards.  (49CFR223)

Rebuilt Passenger Car: A passenger car that has undergone overhaul which has been identified by the railroad as a capital expense under Interstate Commerce Commission (ICC) accounting standards.  (49CFR223)

Receiver: A device on a locomotive, so placed that it is in position to be influenced inductively or actuated by an automatic train stop, train control or cab signal roadway element.  (49CFR236)

Receiver Coil: Concentric layers of insulated wire wound around the core of a receiver of an automatic train stop, train control or cab signal device on a locomotive.  (49CFR236)

Receptacle: A containment vessel for receiving and holding materials, including any means of closing.  (49CFR171)

Reception Minimum Altitude: The lowest altitude at which an intersection can be determined.  (FAA4)

Reconciling Items: Items where accounting practices vary for handling these expenses as a result of local ordinances and conditions. Reconciling items include depreciation and amortization, interest payments, leases and rentals. They are called reconciling items because they are needed to provide an overall total that is consistent with local published reports.  (FTA1)

Recreational Boat: 1) Any vessel manufactured or used primarily for noncommercial use; leased, rented or chartered to another for the latter's noncommercial use; or 2) Engaged in the carrying of six or fewer passengers.  (USCG1)

RECS: Residential Energy Consumption Survey  (DOE4)

Reduction: Used to indicate the slower output speed resulting from a ratio proportion (faster on reductions of less than 1; 1) single reduction: a single set of reducing gears in the rear axle; 2) double reduction: an additional gear-set in the rear axle to reduce output speed further. May or may not be used as a 2-speed rear axle.  (TII1)   (TII2)

Reef: A ridge of rocks lying near the surface of the sea, which may be visible at low tide, but is usually covered by water.  (DOI3)   (DOI4)

Reef Area: An area identified as a danger to maritime navigation containing one or more chains of rocks or coral, at or near the surface of the water.  (DOI3)

Reef Pool: Pocket of sea/ocean completely surrounded by a coral reef.  (DOI3)

Reefer: Refrigerated truck or trailer designed for hauling perishables.  (ATA1)

Reefing Current: Current where the swift water reaches the slack water and creates boils or continues boils or turbulent water. It is considered the edge of the reef or what would be a reef were one there.  (TNDOT1)

Refined Petroleum Pipelines: Establishments primarily engaged in the pipeline transportation of refined products of petroleum, such as gasoline and fuel oil.  (BOC1)

Refined Petroleum Products: Refined petroleum products include but are not limited to gasolines, kerosene, distillates (including No. 2 fuel oil), liquefied petroleum gas, asphalt, lubricating oils, diesel fuels, and residual fuels.  (DOE5)

Reflective Material: (See also Left Bank, Reflex Reflector, Retro-Reflective Material, Right Bank) A material conforming to Federal Specification L-S300, "Sheeting and Tape, Reflective; Non-exposed Lens, Adhesive Backing," (September 7, 1965) meeting the performance standard in either Table 1 or Table 1A of Society of Automotive Engineers (SAE) Standard J594f, "Reflex Reflectors" (January, 1977).  (49CFR393)

Reflex Reflector: (See also Reflective Material) A device which is used on a vehicle to give an indication to an approaching driver by reflected lighted from the lamps on the approaching vehicle.  (49CFR393)

Reformulated Motor Gasoline: (See also Gasoline) Motor gasoline, formulated for use in motor vehicles, the composition and properties of which are certified as reformulated motor gasoline by the Environmental Protection Agency.  (DOE3)   (DOE5)

Refueling Track: Airspace designated for conducting aerial refueling.  (DOI4)

Regional Distribution Port: Waterfront area which 1) Is identifiable with a Standard Metropolitan Statistical Area (SMSA) as defined by the U.S. Bureau of Census, 2) Has 10 or more commercial terminal facilities located within a reasonable distance of the general area, 3) Is served by at least two Class I railroads, and 4) Is served by at least five interstate or U.S. highways.  (TNDOT1)

Register Breadth: The breadth of a vessel at its widest part measured from the outerside of the planking or plating on one side to the corresponding point on the opposite side.  (USCG4)

Register Depth: The depth of a vessel measured from the underside of the tonnage deck, amidships, to the bottom of the hold. The depth is not the draft of a vessel.  (USCG4)

Registered Active General Aviation Aircraft: A civil aircraft registered with the FAA that has been flown one or more hours during the previous calendar year. Excluded are aircraft owned and operated in regularly scheduled, non-scheduled, or charter service by commercial air carriers and aircraft in excess of 12,500 pounds maximum gross takeoff weight, and owned and operated by a commercial operator certificated by the FAA to engage in intrastate common carriage.  (FAA14)

Registered Aircraft: Aircraft registered with the Federal Aviation Administration.  (FAA6)   (FAA9)

Registered Inspector: A person registered with the Department [of Transportation (DOT)] in accordance with 49 CFR 107 Subpart F who has the knowledge and ability to determine if a cargo tank conforms with the applicable DOT specification and has, at a minimum, any of the combinations of education and work experience in cargo tank design, construction, inspection, or repair set out in 49 CFR 171.8.  (49CFR171)

Regular Gasoline: See also Gasoline.

Regular Grade Gasoline: (See also Gasoline) A grade of unleaded gasoline with a lower octane rating (approximately 87) than other grades. Octane boosters are added to gasoline to control engine preignition or "knocking" by slowing combustion rates.  (DOE4)   (DOE5)

Regular Leaded Gasoline: (See also Gasoline) Gasoline having an antiknock index (R+M/2) greater than or equal to 87 and less than or equal to 90 and containing more than 0.05 grams of lead or 0.005 grams of phosphorus per gallon.  (DOE5)

Regular Unleaded Gasoline: (See also Gasoline) Gasoline having an antiknock index (R+M/2) greater than or equal to 85 and less than 88, and containing not more than 0.05 grams of lead or 0.005 grams of phosphorus per gallon.  (DOE5)

Regularly Employed Driver: A driver who, in any period of 7 consecutive days, is employed or used as a driver solely by a single motor carrier.  (49CFR390)

Regulated Motor Carrier: A carrier subject to economic regulation by the Interstate Commerce Commission.  (ATA2)

Regulation: Any agency statement of general or particular applicability designed to implement, interpret, or prescribe policy in order to carry out the purpose of a law. Synonymous with "rule" it has the force of law.  (USCG1)

REIL: Runway - End Identification Lights  (FAA4)   (FAA17)   (FAA19)

REIS: Regional Economic Information Systems  (BTS7)

Relayed Cut-Section: A cut-section where the energy for one track circuit is supplied through front contacts or through front and polar contacts of the track relay for the adjoining track circuit.  (49CFR236)

Reliever Airport: An airport designated by the Secretary of Transportation as having the function of relieving current or forecast congestion at a commercial service airport and providing more general aviation access to the overall community.  (FAA2)   (FAA11)

Relocated Threshold: A threshold located at a point on the runway other than the beginning of the runway pavement. The portion of pavement behind a relocated threshold is not available for takeoff.  (FAA12)

Remanufactured Vehicle: (See also Rebuild) A vehicle which has been structurally restored and has had new or rebuilt major components installed to extend its service life.  (49CFR37)

Remote Areas: Sparsely populated areas such as mountains, swamps, and large bodies of water.  (FAA8)

Remote Communications Outlet (RCO): An unmanned communications facility remotely controlled by air traffic personnel.  (FAA8)

Renewable Energy: Energy obtained from sources that are essentially inexhaustible (unlike, for example, the fossil fuels, of which there is a finite supply). Renewable sources of energy include wood, waste, photovoltaic, and solar thermal energy.  (DOE3)

Rental of Railroad Cars: Establishments primarily engaged in renting or leasing railroad cars, whether or not also performing services connected with the use thereof, or in performing services connected with the rental of railroad cars.  (BOC1)

Replacement Standard: The estimated useful life of a motor vehicle expressed in time (months or years) and/or utilization (miles).  (GSA2)

Replacement Vehicle: A vehicle acquired to replace a vehicle in inventory that meets the replacement standard or becomes uneconomical to retain in service.  (GSA2)

Reportable Accident: A motor vehicle accident involving a carrier subject to the Department of Transportation Act, which results in a fatality, injury, or property damage of $4,400 or more.  (FHWA2)   (FHWA4)

Reportable Damage: Includes labor costs and all other costs to repair or replace in kind damaged on-track equipment, signals, track, track structures or roadbed. Reportable damage does not include the cost of clearing a wreck; however, additional damage to the above listed items caused while clearing the wreck is to be included in your damage estimate. Examples of other costs included in reportable damage are: 1) Rental and/or operation of machinery such as cranes, bulldozers, etc., including the services of contractors, to replace or repair the track right-of-way and associated structures; and 2) Costs associated with the repair or replacement of roller bearings on units that were derailed or submerged in water (replacement costs means the labor costs resulting from a wheel set change out).  (FRA2)

Reportable Death, Injury or Illness: Any event arising from the operation of a railroad which results in: 1) death to one or more persons; 2) injury to one or more persons, other than railroad employees, that requires medical treatment; 3) injury to one or more employees that requires medical treatment or results in restriction of work or motion for one or more days, one or more lost workdays, transfer to another job, termination of employment, or loss of consciousness; or 4) any occupational illness of a railroad employee, as diagnosed by a physician.  (FRA4)

Reportable Vehicle: All sedans, station wagons, ambulances, buses, carryalls, trucks and truck tractors. Excluded are semitrailers, trailers, and other trailing equipment such as pole trailers, dollies, cable reels, trailer coaches and bodies, portable wheeled compressors, trucks with permanently mounted equipment (e.g. generators, air compressors, etc.), fire trucks, motorcycles, electric and hybrid powered electric vehicles and military design motor vehicles.  (GSA1)

Reporting Point: A geographical location in relation to which the position of an aircraft is reported.  (14CFR1)

Reporting Threshold: The level of railroad property damage, resulting from a train accident involving on-track equipment, over which a railroad company must report the accident to the Federal Railroad Administration. Reportable damages include the cost of labor and the cost of repairing (or replacing in kind) damaged on-track equipment, track, track structure, or roadbed.  (FRA3)

Reporting Unit: Any Coast Guard Command having its own OPFAC (Operating Facility) code (and, therefore, an individual accountability).  (USCG3)

Representative Vehicle: A motor vehicle which represents the type of motor vehicle that a driver applicant operates or expects to operate.  (49CFR383)

Rescue Coordination Center (RCC): A search and rescue (SAR) facility equipped and manned to coordinate and control SAR operations in an area designated by the SAR plan. The U.S. Coast Guard and the U.S. Air Force have responsibility for the operation of RCCs.  (FAA8)

Research: Investigation or experimentation aimed at the discovery of new theories or laws and the discovery and interpretation of facts or revision of accepted theories or laws in the light of new facts.  (49CFR171)

Research and Special Programs Administration (RSPA): The Administration was established formally on September 23, 1977. It is responsible for hazardous materials transportation and pipeline safety, transportation emergency preparedness, safety training, multimodal transportation research and development activities, and collection and dissemination of air carrier economic data. It includes the Office of Hazardous Materials Safety; the Office of Pipeline Safety; the Office of Research Technology, and Analysis; the Office of University Research and Education; the Office of Automated Tariffs; the Office of Research Policy and Technology Transfer; the Volpe National Transportation Systems Center; and the Transportation Safety Institute.  (OFR1)

RESERVE: Reserve Training  (USCG5)

Reset Device: A device whereby the brakes may be released after an automatic train control brake application.  (49CFR236)

Residential District: The territory adjacent to and including a highway which is not a business district and for a distance of 300 feet or more along the highway is primarily improved with residences.  (49CFR390)

Residential Transportation Energy Consumption Survey (RTECS): This survey was designed by the Energy Information Administration of the Department of Energy to provide information on how energy is used by households for personal vehicles. It has been conducted five times since 1979, the most recent being 1991.  (DOE6)

Residential Vehicle: Motorized vehicles used by U.S. households for personal transportation. Excluded are motorcycles, mopeds, large trucks, and buses. Included are automobiles, station wagons, passenger vans, cargo vans, motor homes, pickup trucks, and jeeps or similar vehicles. In order to be included, vehicles must be 1) Owned by members of the household, or 2) Company cars not owned by household members but regularly available to household members for their personal use and ordinarily kept at home, or 3) Rented or leased for 1 month or more.  (DOE5)

Residual Fuel Oils: The topped crude of refinery operations, which includes No. 5 and No. 6 fuel oils, as defined in ASTM Specification D 396 and Federal Specification, VV-F-815C; Navy Special Fuel oil as defined in Military Specification MIL-F-859E including Amendment 2 (NATO symbol F-77); and Bunker C fuel oil. Residual fuel oil is used for the production of electric power, space heating, vessel bunkering, and various industrial purposes.  (DOE2)

Residual Fuel Oils: The heavier oils that remain after the distillate fuel oils and lighter hydrocarbons are distilled away in refinery operations and that conform to American Society for Testing and Materials (ASTM) Specifications D396 and 975. Included are No. 5, a residual fuel oil of medium viscosity; Navy Special, for use in steam-powered vessels in government service and in shore power plants; and No. 6, which includes Bunker C fuel oil and is used for commercial and industrial heating, electricity generation, and to power ships. Imports of residual fuel oil include imported crude oil burned as fuel.  (DOE3)   (DOE5)

Residue: The hazardous material remaining in a packaging, including a tank car, after its contents have been unloaded to the maximum extent practicable and before the packaging is either refilled or cleaned of hazardous material and purged to remove any hazardous vapors.  (49CFR171)

Resource: Any personnel or property used in rendering assistance.  (USCG3)

Response Activities: The containment and removal of oil from the water and shorelines, the temporary storage and disposal of recovered oil, or the taking of other actions as necessary to minimize or mitigate damage to the environment.  (49CFR194)

Response Area: The inland zone or coastal zone, as defined in the National Contingency Plan (40 CFR 300), in which the response activity is occurring.  (49CFR194)

Response Plan: The operator's core plan and the response zone appendices for responding, to the maximum extent practicable, to a worse case discharge of oil,or the substantial threat of such a discharge.  (49CFR194)

Response Resources: The personnel, equipment, supplies, and other resources necessary to conduct response activities.  (49CFR194)

Response Zone: A geographic area either along a length of pipeline or including multiple pipelines, containing one or more adjacent line sections, for which the operator must plan for the deployment of, and provide, spill response capabilities. The size of the zone is determined by the operator after considering available capability, resources, and geographic characteristics.  (49CFR194)

Rest Site: A roadside area usually having facilities for people and/or vehicles.  (DOI3)

Restoring Feature: An arrangement on an electro-pneumatic switch by means of which power is applied to restore the switch movement to full normal or to full reverse position, before the driving bar creeps sufficiently to unlock the switch with control level in normal or reverse position.  (49CFR236)

RESTRACEN: Reserve Training Center  (RSPA1)

Restraint Usage: (See also Mandatory Use Seat Belt Law, Manual Restraint System) Manually operated restraint systems include shoulder belts, lap belts, lap and shoulder belt combinations, or child safety seats. Automatic restraint systems include passive belts and air bag systems.  (NHTSA2)

Restricted Area: Airspace designated under Federal Aviation Regulations (FAR), Part 73, within which the flight of aircraft, while not wholly prohibited, is subject to restriction. Most restricted areas are designated joint use and Intermediate Fix/Visual Flight Rules IF/VFR operations in the area may be authorized by the controlling Air Traffic Control (ATC) facility when it is not being utilized by the using agency. Restricted areas are depicted on en route charts. Where joint use is authorized, the name of the ATC controlling facility is also shown.  (FAA8)

Restricted Road: Public road with restricted public use.  (DOI3)

Restricted Speed: A speed that will permit stopping within one-half the range of vision, but not exceeding 20 miles per hour.  (49CFR236)

Restriction of Work or Motion: The inability of a railroad employee to perform all normally assigned duties because of injury or occupational illness, and includes the assignment of a railroad employee to another job or to less than full time work at a temporary or permanent job.  (49CFR225)

Retail Gasoline (Motor) Prices: (See also Gasoline) Motor gasoline prices calculated each month by the Bureau of Labor Statistics (BLS) in conjunction with the construction of the Consumer Price Index (CPI). Those prices are collected in 85 urban areas selected to represent all urban consumers about 80 percent of the total U.S. population. The service stations are selected initially, and on a replacement basis, in such a way that they represent the purchasing habits of the CPI population. Service stations in the current sample include those providing all types of service (i.e., full -, mini -, and self-service).  (DOE5)

Retained Earnings: Net income or loss from all operations of the corporate entity less dividends and net unrealized loss on noncurrent marketable equity securities.  (BTS4)

Retarding Basin: Basin or embarked area for retarding the flow of flood waters.  (DOI3)

RETCO: Regional Emergency Transportation Coordinator  (MTMC1)

RETREP: Regional Emergency Transportation Representatives  (MTMC1)

Retro-Reflective Material: (See also Reflective Material) A type of material applied either in strips or sheets which reflects searchlight illumination; used on all aids to navigation, both unlighted and lighted, afloat and ashore.  (TNDOT1)

Revenue: Pertaining to transport activities for which remuneration is received by the carrier.  (BTS5)   (FAA10)   (FAA11)   (FAA15)

Revenue Bonds: The most common form of financing for port authorities. The bonds usually name a specific facility whose income is pledged as security. The power to issue revenue bonds, as well as any other fiscal power, must come from the authority's charter or legislative acts authorizing the creation of such an authority.  (TNDOT1)

Revenue Load Factor: The percent that revenue ton-miles (passenger and nonpassenger) are of available ton-miles in revenue services, representing the proportion of the overall capacity that is actually sold and utilized.  (BTS6)

Revenue Load Per Aircraft Mile: The average total tonnage carried per aircraft in revenue services derived by dividing overall revenue ton miles by the aircraft miles flown in revenue services.  (BTS5)

Revenue Passenger: Person receiving air transportation from the air carrier for which remuneration is received by the carrier. Air carrier employees or others receiving air transportation against whom token service charges are levied are considered nonrevenue passengers. Infants for whom a token fare is charged are not counted as passengers.  (BTS5)   (FAA11)   (FAA15)   (NTSB1)

Revenue Passenger Enplanements: (See also Enplanement) 1) The total number of passengers boarding aircraft. Includes both originating and connecting passengers. 2) Total number of revenue passengers boarding aircraft in scheduled service including origination, stopover or connecting passengers.  (ATAB1)   (BTS5)   (FAA14)

Revenue Passenger Load Factor: The percent that revenue passenger-miles are of available seat-miles in revenue passenger services, representing the proportion of aircraft seating capacity that is actually sold and utilized.  (BTS5)   (FAA14)

Revenue Passenger Mile (RPM): One revenue passenger transported one mile in revenue service. Revenue passenger miles are computed by summation of the products of the revenue aircraft miles flown on each inter-airport hop multiplied by the number of revenue passengers carried on that hop.  (BTS5)   (BTS6)   (FAA14)

Revenue Passenger Trips: The number of fare-paying transit passengers with each person counted once per trip; excludes transfer and non-revenue trips.  (APTA1)

Revenue Plane-Miles: The total plane miles flown in revenue service.  (NTSB1)

Revenue Seat Mile: The movement of one transit passenger seat over 1 mile. In other words, the total number of revenue seat miles for a vehicle is obtained by multiplying the number of revenue seats in the vehicle by the number of revenue miles traveled.  (TRB1)

Revenue Service: The time when a vehicle is available to the general public and there is a reasonable expectation of carrying passengers that either directly pay fares, are subsidized by public policy, or provide payment through some contractual arrangement. Vehicles operated in fare free service are considered in revenue service. Revenue service excludes deadhead, school bus, and charter service.  (FTA1)

Revenue Ton Mile: The movement of a ton of freight one mile for revenue.  (AAR1)

Revenue Ton Mile (RTM): One ton of revenue traffic transported one mile.  (ATAB1)   (BTS5)   (BTS6)   (FAA14)

Revenue Ton-Miles: Revenue freight traffic measured in ton-miles.  (FRA3)

Revenue Vehicle Mile: The distance in miles that a revenue vehicle is operated while it is available for passenger service.  (TRB1)

Revenue Vehicle Operation: All activities associated with revenue vehicle operation including moving revenue vehicles along routes while boarding and discharging passengers, deadheading, laying-over, moving operators to relief points, and assisting passenger loading.  (FTA1)

Revenue Vehicles: The floating and rolling stock used in providing transit service for passengers. The term revenue vehicles includes the body and chassis and all fixtures and appliances inside or attached to the body or chassis, except fare collection equipment and revenue vehicle movement control equipment (radios).  (FTA1)

Reverse Commuting: Movement in a direction opposite the main flow of traffic, such as from the central city to a suburb during the morning peak period.  (APTA1)

RF: Radio Frequency  (FAA19)

RFI: Radio Frequency Interference  (FAA19)

RFP: Request for Proposal  (FAA19)

RFTA: Regional Fuel Tax Agreement  (FHWA10)

RGCSP: Review of General Concepts of Separation Panel  (FAA17)

RGR: Regional Rail  (TRB1)

RHIB: Rigid Hull Inflatable Boat  (USCG5)

RIA: Regulatory Impact Analysis  (VDOT)

RIC: Richmond International Airport - Byrd Field  (FAA11)

Ride Quality: A measure of the comfort level experienced by a passenger in a moving vehicle, including the vibration intensity and frequency, accelerations (longitudinal, transverse, and vertical), jerk, pitch, yaw, and roll.  (TRB1)

Ride Shot Gun: Not driving; riding on right side of cab.  (ATA1)

Ridership: The number of rides taken by people using a public transportation system in a given time period.  (APTA1)

Ridesharing: A form of transportation, other than public transit, in which more than one person shares the use of the vehicle, such as a van or car, to make a trip. Also known as "carpooling" or "vanpooling."  (APTA1)

Ridge Line: The line separating drainage basins.  (DOI4)

Rig: Truck, tractor-semitrailer, truck and full trailer, or other combination.  (ATA1)

Rigging: A collective term describing wire cables, chain length, ratchet turnbuckles, and other miscellaneous associated gear used for securing barges in a tow.  (TNDOT1)

Right Bank: (See also Left Bank, Reflective Material) The right descending bank of a river on which side are maintained black buoys, green or white lights, and white or silver reflective material.  (TNDOT1)

Right of Way: (See also Controlled Access Rights-of-Way; Exclusive Rights-of-Way) The land (usually a strip) acquired for or devoted to highway transportation purposes.  (FHWA2)

Right-Hand Draft: Current which pulls tow to right.  (TNDOT1)

RIMS: Regional Information Management System  (FHWA7)

RIP: Rest In Peace

Riparian: Pertaining to land adjacent to the water line.  (TNDOT1)

Riprap: A group of concrete slabs or stones used in bank improvement and around other types of marine construction to protect against erosion from the swift water.  (TNDOT1)

RIRS: Railroad Inspection Reporting System  (BTS8)

Rising River: The river condition when gage readings are increasing day by day.  (TNDOT1)

River Gage: A gage measuring height of water located farther along the river than just above and below a dam.  (TNDOT1)

River Mileage: Designated mileage from the mouth of the river used for identifying locations along the riverbanks. An exception is the Ohio River, on which mileage commences from the head of the river in lieu of the mouth.  (TNDOT1)

River Stage: The height of the water at a certain location on a given day.  (TNDOT1)

River Wall: The lock wall on the river side.  (TNDOT1)

RLR: Red Light Running  (NHTSA6)

RMI: Radio Magnet Indicator  (FAA4)

RML: Radar Microwave Link  (FAA19)

RMM: Remote Maintenance Monitoring  (FAA17)   (FAA19)

RMMS: Remote Maintenance Monitoring System  (FAA19)

RMP: Rotorcraft Master Plan  (FAA17)

RMS: Remote Monitoring System  (FAA19)

RNAV: Remote Area Navigation  (FAA6)   (FAA8)

RND: Railroads for National Defense  (MTMC1)

RNO: Reno Cannon International Airport  (FAA11)

RNP: Required Navigation Performance  (FAA7)

RNPC: Required Navigation Performance Capability  (FAA17)

RO/RO: Roll On / Roll Off  (MARAD1)   (MARAD4)

Road: See also Arterial, Expressway, Freeway, Highway, Local Streets and Roads, Roadway.

Road: An open way for the passage of vehicles, persons, or animals on land.  (DOI4)

Road Call: (See also Roadcalls for Mechanical Failure, Roadcalls for Other Reasons) Unscheduled maintenance requiring either the emergency repair or service of a piece of equipment in the field or the towing of the unit to the garage or shop.  (GSA2)

Road Class: The category of roads based on design, weatherability, their governmental designation, and the Department of Transportation functional classification system.  (DOI3)

Road Functional Classification: The classification of a road in accordance with the Bureau of Land Management (BLM) 9113.16. Code as follows: C-collector, L-local, R-resource.  (DOI2)

Road Gate: Gate blocking entrance to a road.  (DOI3)

Road Hog: Motorist who takes more than his share of the highway.  (ATA1)

Road Miles: The length in miles of the single or first main track measured by the distance between terminals or stations, or both. Road miles does not include industrial and yard tracks, sidings, and all other tracks not regularly used by road trains operated in such specific service, and lines operated under a trackage rights agreement.  (49CFR245)

Road Oil: Any heavy petroleum oil, including residual asphaltic oil used as a dust palliative and surface treatment on roads and highways. It is generally produced in six grades, from 0, the most liquid, to 5, the most viscous.  (DOE3)   (DOE5)

Road or Trail Restrictions: Limitations placed on the use of a road or trail. Code as follows: S-seasonal closure, Y-closed yearlong to motorized vehicles, R-restriction on types of traffic allowed on road, L-limitations on vehicle dimensions, weight, or speed, N-no restrictions applied, B-no bicycles, E-no equestrians, M-no motorized vehicle, P-permit required for use.  (DOI2)

Roadbed: 1) In railroad construction, the foundation on which the ballast and track rest. 2) In highway construction, the graded portion of a highway within top and side slopes, prepared as a foundation for the pavement structure and shoulder.  (TRB1)

Roadcalls For Mechanical Failure: (See also Road Call) A revenue service interruption caused by failure of some mechanical element of the revenue vehicle. Mechanical failures include breakdowns of air equipment, brakes, body parts, doors, cooling system, heating system, electrical units, fuel system, engine, steering and front axle, rear axle and suspension, and torque converters.  (FTA1)

Roadcalls For Other Reasons: (See also Road Call) A revenue service interruption caused by tire failure, farebox failure, wheel chair lift failure, air conditioning system, out of fuel-coolant-lubricant, and other causes not included as mechanical failures.  (FTA1)

Roadway: See also Road.

Roadway: The portion of a highway, including shoulders, for vehicular use.  (FHWA2)

Roadway: That part of a trafficway used for motor vehicle travel.  (NHTSA1)   (NHTSA2)   (NHTSA3)   (NHTSA4)

Roadway Element: That portion of the roadway apparatus of automatic train stop, train control, or cab signal system, such as electric circuit, inductor, or trip arm to which the locomotive apparatus of such system is directly responsive.  (49CFR236)

Roadway Function Class: The classification describing the character of service the street or highway is intended to provide.  (NHTSA3)

ROC: Greater Rochester International Airport  (FAA11)

ROC: Rail Operations Center  (MTMC1)

Rock Area: An area identified as a danger to maritime navigation containing one or more rocks.  (DOI3)

Rock Berm: A mound or strip of stone placed against the side of a structure near the base to act as a buttress.  (TNDOT1)

Rock Cut: A dredged channel cut through rocky bottom. Requires particularly careful marking with aids to navigation and is generally narrow, requiring extreme caution on the part of the navigator.  (TNDOT1)

Rock It: To free vehicle from mud or snow by alternately driving forward and reverse.  (ATA1)

Rocker Link: That portion of an interlocking machine which transmits motion between the latch and the universal link.  (49CFR236)

Rocket: An aircraft propelled by ejected expanding gases generated in the engine from self-contained propellants and not dependent on the intake of outside substances. It includes any part which becomes separated during the operation.  (14CFR1)

Rocky Mountain Double: A combination vehicle consisting of a tractor, a 45 to 48 foot semitrailer and a shorted 28 foot semitrailer.  (ATA2)

ROCSIM: Railroad Operations Computer Simulation  (FTA4)

ROH: Rear Overhang  (TII2)   (TII1)

Roll and Rest: When a long haul driver drives and stops at regular intervals to sleep.  (ATA1)

Roll On/Roll Off: A method of ocean cargo service using a vessel with ramps which allows wheeled vehicles to be loaded and discharged without cranes.  (MARAD2)

Roll On/Roll Off (RO/RO) Vessel: Ships which are especially designed to carry wheeled containers trailers, or other wheeled cargo, and use the roll-on/roll-off method for loading and unloading.  (MARAD1)

Roll Vessel: A vessel designed to permit rail cars or highway trailers to move from the terminal to the vessel over a ramp, with a switch engine as motor power to move the containers.  (TNDOT1)

Roller Dam: A dam constructed of a series of concrete piers across the river with a series of steel cylindrical drums between each pier. These drums are rolled up and down an inclined gear track in the piers, thus controlling the flow of water through the dam. Water passes under the rollers rather than over the top as in a fixed or wicket dam.  (TNDOT1)

Roller Gate: A gate designed to control the flow of water through a roller dam.  (TNDOT1)

Rolling Equipment: Includes locomotives, railroad cars, and one or more locomotives coupled to one or more cars.  (49CFR218)

Rolling Stock: The vehicles used in a transit system, including buses and rail cars.  (APTA1)

Rollover: (See also Accident, Jackknife) Rollover is defined as any vehicle rotation of 90 degrees or more about any true longitudinal or lateral axis.  (NHTSA1)   (NHTSA3)

Rolltop: Trailer with a sliding roof to permit crane loading.  (ATA1)

Root of a Dike: The portion of the dike that abuts the adjacent shore.  (TNDOT1)

ROT: Runway Occupancy Time  (FAA17)

Rotating Airport Beacon: A visual Navigation Aid (NAVAID) operated at many airports. At civil airports, alternating white and green flashes indicate the location of the airport. At military airports, the beacons flash alternately white and green, but are differentiated from civil beacons by dual peaked (two quick) white flashes between the green flashes.  (FAA4)

Rotation: The reassignment of vehicles either within or between agencies to equalize mileage.  (GSA2)

Rotorcraft: A heavier-than-air aircraft that depends principally for its support in flight on the lift generated by one or more rotors.  (14CFR1)   (AIA1)   (FAA3)

Rotorcraft Load Combination: The combination of a rotorcraft and an external load, including the external load attaching means.  (14CFR1)

Rotorcraft Load Combination Class A: A rotorcraft load combination means one in which the external load cannot move freely, cannot be jettisoned, and does not extend below the landing gear.  (14CFR1)

Rotorcraft Load Combination Class B: A rotorcraft load combination means one in which the external load is jettisonable and is lifted free of land or water during the rotorcraft operation.  (14CFR1)

Rotorcraft Load Combination Class C: A rotorcraft load combination means one in which the external load is jettisonable and remains in contact with land or water during the rotorcraft operation.  (14CFR1)

Rotorcraft Load Combination Class D: A rotorcraft load combination means one in which the external load is other than a Class A, B, or C and has been specifically approved by the [Federal Aviation Administration (FAA)] Administrator for that operation.  (14CFR1)

Roundabout: Area of water subject to a routing measure restricting ship movement to a counterclockwise direction.  (DOI4)

Route: See also Arterial, Expressway, Freeways and Expressways, Highway, Local Streets and Roads, Road, Roadway.

Route: The course or way which is, or is to be, traveled.  (49CFR236)

Route: A designated path through a road network.  (DOI3)

Route: A defined path, consisting of one or more courses in a horizontal plane, which aircraft traverse over the surface of the earth.  (FAA8)

Route Locking: Electric locking, effective when a train passes a signal displaying an aspect for it to proceed, which prevents the movement of any switch, movable-point frog, or derail in advance of the train within the route entered. It may be so arranged that as a train clears a track section of the route, the locking affecting that section is released.  (49CFR236)

Route Miles: The total number of miles included in a fixed route transit system network.  (APTA1)

Route Segment: A part of a route. Each end of that part is identified by a continental or insular geographical location; or a point at which a definite radio fix can be established.  (14CFR1)

ROW: Right of Way  (FTA3)   (FTA4)

RPEV: Roadway Powered Electric Vehicle  (FHWA14)

RPI: Railway Progress Institute  (ENO1)

RPM: Revenue Passenger Mile  (BTS2)   (FAA14)   (RSPA1)   (RSPA2)

RPZ: Runway Protection Zone  (FAA12)

RR: Railroad  (BTS2)

RRB: Railroad Retirement Board  (OFR1)

RRF: Ready Reserve Force  (MARAD4)

RRI: Reference Roughness Index  (FHWA8)

RRIS: Railroad Research Information Service  (TRB1)

RRL: Runway Remaining Lights  (FAA16)

RRT: Rail Rapid Transit  (TXDOT)

RSA: Runway Safety Area  (FAA12)

RSE: Relative Standard Error  (DOE4)

RSLS: Runway Status Light System  (FAA17)

RSPA: Research and Special Programs Administration  (FAA2)   (FAA3)   (OFR1)   (RSPA1)

RSS: Rail Security Service  (MTMC1)

RSS: Rail Surveillance Service  (MTMC1)

RSU: Railway Services Unit  (MTMC1)

RSU: Runway Supervisory  (MTMC1)

RSVP: Respondez S`Il Vous Plait

RSW: Southwest Florida International Airport  (FAA11)

RT: Rail Transit  (BTS)

RT-TRACS: Real-Time Traffic Adaptive Signal Control  (FHWA14)

RTAP: Rural Technical Assistance Program  (VDOT)

RTCA: Radio Technical Commission for Aeronautics  (FAA17)   (FAA7)

RTEC: Residential Transportation Energy Consumption  (DOE3)

RTECS: Residential Transportation Energy Consumption Survey  (DOE4)

RTM: Revenue Ton - Mile  (FAA14)   (RSPA1)

RTOR: Right Turn On Red  (NHTSA6)

RTR: Remote Transmitter/Receiver  (FAA4)   (FAA19)

RTRRM: Response Type Road Roughness Meter  (FHWA8)

RTS: Remote Terminal Site  (MTMC1)

Rubbing Stake (or Timber): A timber, or timbers, usually parallel to the water surface, used as fenders along which boats or barges may slide, or rub, without damage to the craft or permanent structure.  (TNDOT1)

Rulemaking (Regulations): The authority delegated to administrative agencies by Congress or State legislative bodies to make rules that have the force of law. Frequently, statutory laws that express broad terms of a policy are implemented more specifically by administrative rules, regulations, and practices.  (DOE5)

Rules of the Road: Statutory and regulatory rules governing navigation of vessels.  (USCG2)

Run Off: (See also Runoff) That portion of the precipitation that flows over the land surface and ultimately reaches streams to complete the water cycle. Melting snow is an important source of this water as well as all amounts of surface water that move to streams or rivers through any given area of a drainage basin.  (DOE5)

Runaway Truck Ramp: A short inclined roadway constructed of sand or other unconsolidated material that exits gradually from and generally runs adjacent to the right lane of a descending highway, expressly for the purpose of stopping runaway trucks.  (DOI3)

Running Clearance: The distance from the surface on which an automobile is standing to the lowest point on the automobile, excluding unsprung weight.  (49CFR523)

Running Track: A track providing end-to-end line continuity and used for working regular trains between stations or places indicated in tariffs as independent points of departure or arrival for the conveyance of passengers or goods.  (UN1)

Runoff: (See also Run Off) The water from all tributaries that enters into a river.  (TNDOT1)

Runway: A straight path on land, used for the landing and takeoff of aircraft.  (DOI4)

Runway: A defined rectangular area on an airport prepared for the landing or takeoff of airplanes.  (FAA12)

Runway Blast Pad: A surface adjacent to the ends of runways provided to reduce the erosive effect of jet blast and propeller wash.  (FAA12)

Runway Incursion: (See also Operational Deviation, Operational Error, Pilot Deviation, Vehicle/Pedestrian Deviation) Any occurrence at an airport involving an aircraft, vehicle, person, or object on the ground that creates a collision hazard or results in loss of separation with an aircraft taking off intending to take off; landing or intending to land. Note: Runway incursions result from one of the following four types of airport surface occurrences: pilot deviations, operational errors, vehicle operator/pedestrian deviations, and pilot/vehicle operator/pedestrian judgmental errors.)  (FAA3)   (FAA10)

Runway Obstacle Free Zone (OFZ): (See also Inner-Approach Obstacle Free Zone, Inner-Transitional Obstacle Free Zone, Obstacle Free Zone) The runway Obstacle Free Zone (OFZ) is a defined volume of airspace centered above the runway. The runway OFZ is the airspace above a surface whose elevation at any point is the same as the elevation of the nearest point on the runway centerline. The runway OFZ extends 200 feet beyond each end of the runway. The width is as follows: 1) For runways serving large airplanes, the greater of: a) 400 feet, or b) 180 feet, plus the wingspan of the most demanding airplane plus 20 feet per 1,000 feet of airport elevation. 2) For runways serving only small airplanes: a) 300 feet for precision instrument runways. b) 260 feet for other runways serving small airplanes with approach speeds of 50 knots or more. c) 120 feet for other runways serving small airplanes with approach speeds of less than 50 knots.  (FAA4)

Runway Protection Zone (RPZ): An area off the runway end (formerly the clear zone) used to enhance the protection of people and property on the ground.  (FAA12)

Runway Safety Area (RSA): A defined surface surrounding the runway prepared or suitable for reducing the risk of damage to airplanes in the event of an undershoot, overshoot, or excursion from the runway.  (FAA12)

Runway Transgression: Any erroneous occupation of a runway at a controlled airport by an aircraft or other controlled vehicle.  (FAA10)

Runway Type: A runway use classification related to its associated aircraft approach procedure.  (FAA12)

Rural: Usually refers to areas with population less than 5,000.  (DOE6)

Rural Area: Outside the limits of any incorporated or unincorporated city, town, village, or any other designated residential or commercial area such as a subdivision, a business or shopping center, or community development.  (49CFR195)

Rural Area: Include all areas of a state outside of the Federal Highway Administration (FHWA) approved adjusted census boundaries of small urban and urbanized areas.  (FHWA2)

Rural Arterial Routes: Those public roads that are functionally classified as a part of the rural principal arterial system or the rural minor arterial system as described in volume 20, appendix 12, Highway Planning Program Manual.  (23CFR470)

Rural Highway: Rural highway is any highway, road, or street that is not an urban highway.  (FHWA5)

Rural Major Collector Routes: Those public roads that are functionally classified as a part of the major collector subclassification of the rural collector system as described in volume 20, appendix 12, Highway Planning Program Manual.  (23CFR470)

RV: Recreational Vehicle  (FHWA3)

RVR: Runway Visual Range  (FAA17)   (FAA19)

RW: Runway  (FAA12)