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U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation
FHWA Highway Safety Programs

LIST OF ABBREVIATIONS AND SYMBOLS

AADT = annual average daily traffic

AAR = Association of American Railroads

AASHTO = American Association of State Highway and Transportation Officials

AAWS = active advance warning sign

ADA = Americans with Disabilities Act

AREMA = American Railway Engineering and Maintenance-of-Way Association

ASLRRA = American Short Line and Regional Railroad Association

BRT = Bus Rapid Transit

C&M = construction and maintenance

CFR = Code of Federal Regulations

Crossing(s) = At-Grade Highway-Rail Crossing(s)

CSD = Clear Storage Distance

DOT = Department of Transportation

DSRC = Dedicated Short-Range Communications

FAPG = Federal-Aid Policy Guide

FARS = Fatal Accident Reporting System

FAST Act = Fixing America's Surface Transportation Act

FHWA = Federal Highway Administration

FMCSA = Federal Motor Carrier Safety Administration

FRA = Federal Railroad Administration

FTA = Federal Transit Administration

GPS = Global Positioning System

HSIP = Highway Safety Improvement

ICC = Interstate Commerce Commission

IEEE = Institute of Electrical and Electronics Engineers

ISTEA = Intermodal Surface Transportation Efficiency Act

ITE = Institute of Transportation Engineers

ITS = Intelligent Transportation Systems

LED = light emitting diode

LRT = light-rail transit

LRV = light-rail vehicles

MAP-21 = Moving Ahead for Progress in the 21st Century Act

MCSAP = Motor Carrier Safety Assistance Program

MPH or mph = miles per hour

MTB = Materials Transportation Bureau

MTCD = Minimum Track Clearance Distance

MUTCD = Manual on Uniform Traffic Control Devices

NCDOT = North Carolina Department of Transportation

NCHRP = National Cooperative Highway Research Program

NCUTCD = National Committee on Uniform Traffic Control Devices

NHS = National Highway System

NHTSA = National Highway Traffic Safety Administration

NSRT = Nationwide Significant Risk Threshold

NTD = National Transit Database

NTSB = National Transportation Safety Board

O&M = Operations and Maintenance

OLI = Operation Lifesaver Incorporated

PHMSA = Pipeline and Hazardous Materials Safety Administration

PL = Public Law

PROWAG = [Draft] Proposed Right-of-Way Accessibility Guidelines

QZRI = Quiet Zone Risk Index

ROW = right-of-way

SAFETEA-LU = Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users

SHSP = Strategic Highway Safety Plan

SMIS = Safety Management Information System

STAA = Surface Transportation Assistance Act

STB = Surface Transportation Board

STP = Surface Transportation Program

TEA-21 = Transportation Equity Act for the 21st Century

TCRP = Transit Cooperative Research Program

TMS = Traffic Management System

TRB = Transportation Research Board

TTC = Temporary Traffic Control

TTCI = Transportation Technology Center, Inc.

TWG = Technical Working Group

U.S.C. = United States Code

USDOT = United States Department of Transportation

UVC = Uniform Vehicle Code

WBAPS = Web Based Accident Prediction System