U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
3S2 | 3-axle tractor with a 2-axle semi-trailer |
AADT | Annual Average Daily Traffic |
AADTT | Annual Average Daily Truck Traffic |
AASHTO | American Association of State Highway and Transportation Officials |
AAWDT | Annual Average Weekday Traffic |
ADMS | Archived Data Management System |
ADT | Average Daily Traffic |
ADUS | Archived Data User Service |
APTS | Advanced Public Transportation Systems |
ARTS | Advanced Rural Transportation Systems |
ASTM | American Society for Testing and Materials |
ATIS | Advanced Traveler Information System |
ATS | Average Tandem Spacing |
ATMS | Advanced Traffic Management System |
ATR | Automated Traffic Recorder |
AVC | Automatic Vehicle Classification |
AVDT | Annual Vehicle Distance Traveled |
BMS | Bridge Management System |
CAAA | Clean Air Act Amendments (1990) |
CCS | Continuous Count Station |
CFR | Code of Federal Regulations |
CMS | Congestion Management System |
CVC | Continuous Vehicle Classifier |
CVO | Commercial Vehicle Operations |
DOT | Department of Transportation |
DOW | Day of Week |
DVDT | Daily Vehicle Distance Traveled |
EAL | Equivalent Axle Loading |
EPA | Environmental Protection Agency |
ESAL | Equivalent Single Axle Loading |
FHWA | Federal Highway Administration |
FIPS | Federal Information Processing Standards |
GIS | Geographic Information System |
GPS | Global Positioning System |
HOD | Hour of Day |
HPMS | Highway Performance Monitoring System |
IRI | International Roughness Index |
ISTEA | Intermodal Surface Transportation Efficiency Act (1991) |
ITS | Intelligent Transportation System |
KIPS | Kilopounds (thousands of pounds) |
LRS | Linear Referencing System |
LTBP | Long Term Bridge Performance |
LTPP | Long Term Pavement Performance |
LTTP | Long-Term Transportation Plan |
MADT | Monthly Average Daily Traffic |
MADTT | Monthly Average Daily Truck Traffic |
MAF | Monthly Adjustment Factor |
MAP-21 | Moving Ahead for Progress in the 21st Century Act (2012) |
MAWDT | Monthly Average Weekday Daily Traffic |
MAWDTT | Monthly Average Weekday Daily Truck Traffic |
MAWET | Monthly Average Weekend Daily Traffic |
MOY | Month of Year |
MPO | Metropolitan Planning Organization |
NEPA | National Environmental Policy Act |
NHPN | National Highway Planning Network |
NHS | National Highway System |
NIT | National Institute of Technology |
NPS | National Park Service |
OFE | Other Freeways and Expressways |
OPA | Other Principal Arterial |
PAS | Principal Arterial System |
PHF | Peak Hour Factor |
PMS | Pavement Management System |
PSR | Present Serviceability Rating |
PTR | Portable Traffic Recorder |
RF | Radio Frequency |
SADT | Seasonal Average Daily Traffic |
SAWA | Steering Axle Weight Average |
SHRP | Strategic Highway Research Program |
TEA21 | Transportation Equity Act for the 21st Century |
TMAS | Travel Monitoring Analysis System |
TMG | Traffic Monitoring Guide |
TVT | Travel Volume Trends |
TWS | Truck Weight Study |
UPACS | User Profile and Access Control System |
VDT | Vehicle Distance Traveled |
VMT | Vehicle Miles Traveled |
VTRIS | Vehicle Travel Information System |
WIM | Weigh-in-Motion |