Highway and Rail Transit Tunnel Inspection Manual

2005 Edition

Glossary

AASHTO

American Association of State Highway and Transportation Officials

AC

Alternating Current

ATSSA

American Traffic Safety Services Association

CCTV

Closed Circuit Television

Chord

A line segment that joins two points on a curve

CO

Carbon Monoxide

CWR

Continuous Welded Rail

DC

Direct Current

ETS

Emergency Trip Switch

FHWA

Federal Highway Administration

FRA

Federal Railroad Administration

FTA

Federal Transit Administration

Gunite

Term commonly used for fine-aggregate shotcrete

gpm

Gallons per minute

IES LM-50

Illuminating Engineering Society, Lighting Measurements - 50

IES RP-22

Illuminating Engineering Society, Recommended Practices - 22

ITE

Institute of Transportation Engineers

Km/h

Kilometers per hour

mph

Miles per hour

MTS

Maintenance Testing Specifications

MUTCD

Manual on Uniform Traffic Control Devices

NATM

New Austrian Tunneling Method (synonymous with SEM)

NBIS

National Bridge Inspection Standards

NBS

National Bureau of Standards

NEMA

National Electric Manufacturers Association

NETA

InterNational Electrical Testing Association

NFPA

National Fire Protection Association

OSHA

Occupational Safety and Health Administration

PEI

Porcelain Enamel Institute

SEM

Sequential Excavation Method (synonymous with NATM)

TBM

Tunnel Boring Machine

TSS

Track Safety Standards

UPS

Uninterruptible Power Supply