U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
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 |