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List of Acronyms

AADT Average Annual Daily Traffic
ADHS Appalachian Development Highway System
ADT Average Daily Traffic
AASHTO American Association of State Highway and Transportation Officials
BCR Benefit-Cost Ratio
CMF Crash Modification Factor
COG Council of Governments
CRF Crash Reduction Factor
D-CS Detection-Control System
DOT Department of Transportation
FHWA Federal Highway Administration
FLMA Federal Land Management Agency
FLTP Federal Lands Transportation Program
FMCSA Federal Motor Carrier Safety Administration
HAWK High Intensity Activated Crosswalk
HRRR High Risk Rural Roads
HRRRP High Risk Rural Roads Program
HSIP Highway Safety Improvement Program
HSM Highway Safety Manual
HSP Highway Safety Plan
ITS Intelligent Transportation Systems
kph kilometers per hour
LED Light Emitting Diode
LTAP Local Technical Assistance Program
MAP-21 Moving Ahead for Progress in the 21st Century Act
mph miles per hour
MPO Metropolitan Planning Organization
MUTCD Manual on Uniform Traffic Control Devices
NACE National Association of County Engineers
NACO National Association of Counties
NCHRP National Cooperative Highway Research Program
NHI National Highway Institute
NHPP National Highway Performance Program
NHS National Highway System
NHTSA National Highway Transportation Safety Administration
RPC Regional Planning Commission
RPO Regional Planning Organization
RRFB Rectangular Rapid Flash Beacon
RSA Roadway Safety Audit
SAFETEA-LU Safe, Accountable, Flexible Efficient Transportation Equity Act: A Legacy for Users
SHSP Strategic Highway Safety Plan
SLOSSS Suggested List of Surveillance Study Sites
SP&R State Planning & Research
STIP Statewide Transportation Improvement Program
STP Surface Transportation Program
TAP Transportation Alternatives Program
TIP Transportation Improvement Program
TTAP Tribal Technical Assistance Program
TTP Tribal Transportation Program
TWLTL Two-Way Left Turn Lane
USC United States Code
USDOT United States Department of Transportation
VMT Vehicle Miles Traveled
vpd vehicles per day

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Page last modified on July 31, 2014.
Safe Roads for a Safer Future - Investment in roadway safety saves lives
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000