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| Acronym | Meaning |
|---|---|
| 3R | Restoration, Rehabilitation, and Resurfacing |
| 4R | 3R plus Reconstruction |
| AAA | American Automobile Association |
| AADL | Annual Average Daily Loading |
| AADT | Annual ADT |
| AADTT | Annual ADTT |
| AADW | Annual Average Days of the Week |
| AAMA | American Automobile Manufacturers Association |
| AAMVA | American Association of Motor Vehicle Administrators |
| AAPA | American Association of Port Authorities |
| AAR | Association of American Railroads |
| AASHO | Former name of AASHTO |
| AASHTO | American Association of State Highway and Transportation Officials |
| AAWDT | Annual Average Weekday Traffic |
| ABA | American Bus Association |
| ABS | Antilock Braking System |
| AC | Asphalt Concrete |
| ACC | Adaptive Cruise Control |
| ACEC | American Consulting Engineers Council |
| ACI | Automatic Cargo Identification |
| ACI | American Concrete Institute |
| ACPA | American Concrete Pavement Association |
| ACS | Automatic Clearance Sensing |
| ADI | Automatic Driver Identification |
| ADIS | Advanced Driver Information Systems |
| ADL | Average Daily Load |
| ADT | Average Daily Traffic (vpd in both directions) |
| ADTT | Average Daily Truck Traffic |
| AEA | American Electronics Association |
| AEI | Automated Equipment Identification |
| AFV | Alternative Fuel Vehicle |
| AGC | Associated General Contractors |
| AHAR | Automatic Highway Advisory Radio |
| AHS | Average Highway Speed |
| AHS | Automated Highway System |
| ALAPCO | Association of Local Air Pollution Control Officials |
| ALF | Accelerated Loading Facility |
| AMFA | Alternative Motor Fuels Act (1988) |
| AMPO | Association of Metropolitan Planning Organizations |
| AMRL | AASHTO Materials Reference Lab |
| ANPRM | Advanced Notice of Proposed Rulemaking |
| ANSI | American National Standards Institute |
| APC | Automated Passenger Counting |
| APCA | American Portland Cement Alliance |
| APTA | American Public Transit Association |
| APTS | Advanced Public Transportation Systems |
| APWA | American Public Works Association |
| AQ | Any Quantity |
| ARAN | Automatic Road Analyzer |
| ART | Applied Research and Technology |
| ARTBA | American Road and Transportation Builders Association |
| ASCE | American Society of Civil Engineers |
| ASTM | American Society for Testing and Materials |
| ATA | American Trucking Associations, Inc. |
| ATC | Automated Toll Collection |
| ATIS | Advanced Traveler Information Systems |
| ATMS | Advanced Traffic Management Systems |
| ATR | Automated Traffic Recorder |
| ATS | American Travel Survey (BTS/Census) |
| ATSAC | Automated Traffic Surveillance and Control System (LA) |
| ATSSA | American Traffic Safety Services Association |
| AVC | Automatic Vehicle Classification |
| AVCG | Advanced Vehicle Control/Guidance |
| AVCI | Automatic Vehicle and Cargo Identification |
| AVCS | Advanced Vehicle Control Systems |
| AVI | Automatic Vehicle Identification |
| AVL | Automatic Vehicle Location |
| AVLS | Automatic Vehicle Location System |
| AVM | Automatic Vehicle Monitoring |
| AVMT | Annual VMT |
| AVO | Average Vehicle Occupancy |
| AVR | Average Vehicle Ridership |
| AVW | Automatic Vehicle Weighing |
| BAMS | Bid Analysis Management System |
| BLCR | Bridge Load Capacity Rating |
| BMCS | Bureau of Motor Carrier Safety |
| BMS | Bridge Management System |
| BPR | Bureau of Public Roads |
| BWIM | Bridge WIM |
| C/M | Climate/Materials |
| CA | Cooperative Agreement |
| CAA | Clean Air Act |
| CAD | Computer-Aided Dispatching |
| CADD | Computer Aided Drafting and Design |
| CADRE | Critical Automated Data Reporting Elements (NHTSA) |
| CAFE | Corporate Average Fuel Efficiency |
| CAO | Chief Administrative Officer |
| CARB | California Air Resources Board |
| CARD | Crash Avoidance Research Data (NHTSA) |
| CBD | Central Business District |
| CCD | Charge-Coupled Device (optical-electrical sensor) |
| CCIR | International Consultative Committee for Radio |
| CCT | Computer Compatible Tape |
| CDL | Commercial Driver's License |
| CDO | Crescent Demonstration Operator |
| CDP | Census Designated Place |
| CERF | Civil Engineering Research Foundation (ASCE) |
| CERL | Construction Engineering Research Laboratory (COE) |
| CFC | Chlorofluorocarbon |
| CFS | Commodity Flow Survey (= CTS) |
| CG | Coordinating Group |
| CHRIS | Chemical Hazard Response Information System |
| CIE | Commission International de l'Eclairage |
| CIH | Compensated Intercorporate Hauling |
| CIM | Classification-in-motion |
| CIMA | Construction Industry Manufacturers Association |
| CL | Carload |
| CLC | Concentrated Load Capacity |
| CLF | Conservation Law Foundation |
| CMAQ | Congestion Mitigation and Air Quality |
| CMP | Congestion Management Program |
| CMS | Changeable Message Sign |
| CMS | Congestion Management System |
| CMV | Commercial Motor Vehicle |
| CNG | Compressed Natural Gas |
| CNTS | Center for National Truck Statistics (UMTRI) |
| CO | Carbon Monoxide |
| COE | Corps of Engineers (U.S. Army) |
| COFC | Container-on-flatcar |
| COG | Council of Government |
| COTS | Commercial Off-the-Shelf |
| CP | Cathodic Protection |
| CRASH | Citizens for Reliable and Safe Highways |
| CRC | Continuously Reinforced Concrete |
| CSO | Council of Standards Organizations |
| CTIPS | Comprehensive Transportation Information and Planning System |
| CTPP | Census Transportation Planning Package |
| CTS | Commodity Transportation Survey |
| CUTC | Council of University Transportation Centers |
| CVIS | Commercial Vehicle Information System |
| CVO | Commercial Vehicle Operations |
| CVSA | Commercial Vehicle Safety Alliance |
| CWIM | Continuous WIM |
| D | Depth (slab thickness) |
| D-factor | Peak directional volume (as percent DHV) |
| DDHV | Directional DHV, vph |
| DEAL | Design Equivalent Axle Load |
| DESAL | Design Equivalent Single Axle Load |
| DHTM | Design Hour Turning Movements |
| DHV | Design Hour Volume = K * ADT (usually 30th highest hour) |
| DIM | Dimension In Motion |
| DIME | Dual Incidence Matrix Encoded files (like TIGER but 1980) |
| DIN | Deutsches Institut fur Normung |
| DL | Driver Licensing |
| DOR | Department of Roads |
| DRGS | Dynamic Route Guidance System |
| DRP | Data Review Package |
| DVKT | Daily Vehicle-Kilometers of Travel |
| DVMT | Daily VMT |
| EAL | Equivalent Axle Load(ing) |
| EBL | Electronic Bill of Lading (or placarding) |
| EDS | Electronic Data Sharing |
| EF | ESAL Factor |
| EIA | Environmental Impact Assessment |
| EIA | Energy Information Administration |
| EIA | Electronic Industries Association |
| EIS | Emergency Information System |
| ELP | Electronic License Plate |
| EMS | Equipment Management System |
| EPACT | National Energy Policy Act: (1992) |
| ERG | Emergency Response Guidebook |
| ESAL | Equivalent Single-Axle Load |
| ETA | Expected Time of Arrival |
| ETC | Environmental Training Center |
| ETC | Electronic Toll Collection |
| ETG | Expert Task Group |
| ETTM | Electronic Toll and Traffic Management |
| EV | Electric Vehicle |
| EWL | Equivalent Wheel Load |
| F&PB | Family and Personal Business travel |
| FAI | Federal Aid Interstate |
| FAP | Federal-Aid Primary |
| FARS | Fatal Accident Reporting System (NHTSA) |
| FAS | Federal-Aid Secondary |
| FAUA | Federal-Aid Urbanized Area |
| FEBBS | FMWA Electronic Bulletin Board System |
| FELIC | Federation of Engineering institute |
| FET | Federal Excise Tax |
| FFY | Federal Fiscal Year |
| FHMR | Federal Hazardous Materials Regulations |
| FHWA | Federal Highway Administration |
| FIP | Federal Implementation Plan |
| FMC | Fleet Management and Control |
| FMC | Federal Maritime Commission |
| FMCSR | Federal Motor Carrier Safety Regulations |
| FMIS | Fiscal Management Information System |
| FMVCP | Federal Motor Vehicle Control Program |
| FOIL | Federal Outdoor Impact Laboratory |
| FRA | Federal Railroad Administration |
| FTA | Federal Transit Administration (formerly UMTA) |
| FTP | Federal Test Procedure (EPA mpg) |
| FUT | Fuel Use Tax |
| FWD | Falling Weight Deflectometer |
| GCP | Ground Control Point |
| GCW | Gross Combination Weight |
| GES | General Estimates System (NHTSA) |
| GIS | Geographic Information System |
| GLCTTR | Great Lakes Center of Truck Transportation Research |
| GOE | General Operating Expenses |
| GPS | General Pavement Studies/Sections |
| GPS | Global Positioning System |
| GRF | Grants for Research Fellowships |
| GRIDS | Geographical Roadway Information Display System |
| GRS | Grid Reference System |
| GVW | Gross Vehicle Weight |
| GVWR | GVW Rating (max weight) |
| HAR | Highway Advisory Radio |
| HC | Hydrocarbons |
| HCAADT | Heavy Commercial AADT |
| HCAS | Highway Cost Allocation Study |
| HCM | Highway Capacity Manual (TRB) |
| HD | Headway Detection |
| HEEP | Highway Engineering Exchange Program |
| HELP | Heavy vehicle Electronic License Plate (Crescent) |
| HERS | Highway Economic Requirements System |
| HETP | Highway Engineer Training Program |
| HF | Highway Finance |
| HGV | Heavy Goods Vehicle |
| HH | Household |
| HIAP | Highway Investment Analysis Package |
| HITEC | Highway Innovative Technology Evaluation Center |
| HM | Hazardous Materials |
| HMR | Hazardous Materials Regulation |
| HNDES | Highway Network Design and Evaluation System |
| HOV | High Occupancy Vehicle |
| HP&R | Highway Planning and Research |
| HPA | High Priority Area |
| HPMS | Highway Performance Monitoring System |
| HPNPA | High Priority National Program Area |
| HPR | Highway Planning and Research |
| HRV | High Resolution Visible |
| HSIRS | Highway Statistics Information Retrieval System |
| HSIS | Highway Safety Information System |
| HSP | High Speed Photographs |
| HSWIM | High Speed WIM |
| HTF | Highway Trust Fund |
| HTFS | Highway Traffic Forecasting System |
| HTIMS | Highway Technology Information Management System |
| HUD | Head-Up Display |
| HUF | Highway Users Federation |
| HUFSAM | HUF for Safety and Mobility |
| HV | Heavy Vehicle |
| HVM | Heavy Vehicle Management |
| HVUT | Heavy Vehicle Use Tax |
| HYSIM | Highway (Driver) Simulator |
| I | Interstate |
| I&M | Inspection and Maintenance |
| IAG | Interagency Agreement |
| IANA | Intermodal Association of North America |
| IBTTA | International Bridge, Tunnel and Turnpike Association |
| ICC | Interstate Commerce Commission |
| ICMP | Interagency Committee on Metric Policy |
| IDEA | Innovations Deserving Exploratory Analysis |
| IEEE | Institute of Electrical and Electronics Engineers, Inc. |
| IFME | International Federation of Municipal Engineers |
| IFTA | International Fuel Tax Agreement |
| IHSD | Interactive Highway Safety Design |
| IIHS | Insurance Institute for Highway Safety |
| ILD | Induction Loop Detector |
| IMC | Interstate Motor Carrier |
| IMS | Information Management System (SHRP: = NPDB) |
| IMS | Intermodal Management System |
| IPWF | International Public Works Federation |
| IRF | International Road Federation |
| IRI | International Roughness Index |
| IRP | International Registration Plan |
| IRTE | Integrated Road Transport: Environment |
| IS | Interstate System |
| ISCTA | Intermodal Safe Container Transportation Act (1992) |
| ISO | International Standards Organization |
| ISTEA | Intermodal Surface Transportation Efficiency Act |
| ISWIM | Intermediate Speed WIM |
| ITE | Institute of Transportation Engineers |
| ITM | Information Technology Manager (GSA) |
| ITS | Institute of Transportation Studies (UCB) Intelligent Transportation System |
| ITSP | International Technology Scanning Program |
| IUPT | International Union of Public Transport |
| IVHS | Intelligent Vehicle-Highway System |
| IVS | In-Vehicle Signing |
| JIT | Just-In-Time |
| K-factor | Peak-hour volume (e.g., DEV / ADT) |
| KIP (S) | Kilopound(s) |
| KMPT | Kilometerpoint |
| KRA | Kingpin-to-rear axle |
| L&D | Loss and Damage |
| LCCA | Life Cycle Cost Analysis |
| LCL | Less-than-carload |
| LCS | Lane Control Signal |
| LCV | Larger/Longer Combination Vehicle |
| LDP | Level of Development Plan |
| LDVS | Larger Dimensioned Vehicle Study |
| LEF | Load Equivalency Factor |
| LMS | Location and Monitoring Service |
| LOS | Level of Service |
| LPG | Liquefied Petroleum Gas |
| LRFD | Load and Resistance Factor Design |
| LRT | Light Rail Transit |
| LSF | Load Safety Factor |
| LSWIM | Low Speed WIM (< 10 mph) |
| LT | Left Turn |
| LTAP | Local Technical Assistance Program (was RTAP) |
| LTL | Less Than Truckload |
| LTPP | Long-Term Pavement Performance (SHRP) |
| M85 | Methanol 85%, gasoline 15% |
| MA | Minor Arterial |
| MADT | Monthly ADT |
| MADW | Monthly Average Days of the Week |
| MAWDT | Monthly Average Weekday Traffic |
| MAWET | Monthly Average Weekend Traffic |
| MCARS | Motor Carrier Accident Reporting System |
| MCMIS | Motor Carrier MIS |
| MCR | Monthly Classification Ratio |
| MCREGIS | Motor Carrier Regulations Information System |
| MCSAP | Motor Carrier Safety Assistance Program |
| MDD | Multi-Depth Deflectometers |
| MFRS | Mileage Facilities Reporting System |
| MIT | Mobile Inspection Trailer |
| ML | Mainline |
| MMS | Maintenance Management System |
| MOE | Measure of Effectiveness |
| MOV | Multiple-Occupant Vehicle |
| MPO | Metropolitan Planning Organization |
| MRM | Mileage Reference Marker |
| MSF | Maximum Service Flow rate, pcphpl |
| MTC | Metropolitan Transportation Commission |
| MTC | Minimum Tolerable Conditions |
| MTMC | Military Traffic Management Command |
| MTR | Monthly Traffic Ratio |
| MTT | Multi-Trailer Truck |
| MUD | Multi-Use Development |
| MUTCD | Manual on Uniform Traffic Control Devices |
| MV | Motor Vehicles |
| MVM | Million Vehicle Miles |
| MVMA | Motor Vehicle Manufacturers Association |
| MWR | Monthly Weight Ratio |
| MY | Model Year |
| NAAQNA | National Ambient Air Quality Nonattainment Area |
| NAAQS | National Ambient Air Quality Standards |
| NACE | National Association of County Engineers |
| NACO | National Association of County Officials |
| NAE | National Academy of Engineering |
| NAGHSR | National Association of Governors' Highway Safety Representatives |
| NAPA | National Asphalt Pavement Association |
| NAPCOM | National Pavement Cost Model |
| NARC | National Association of Regional Councils |
| NAS | National Academy of Sciences |
| NASS | National Accident Sampling System |
| NATS | North American Trucking Survey (AAR) |
| NBI | National Bridge Inventory |
| NC-UTCD | National Committee on Uniform Traffic Control Devices |
| NCAP | New Car Assessment Program (NHTSA) |
| NCEER | National Center for Earthquake Engineering Research |
| NCHRP | National Cooperative Highway Research Program |
| NCP | Nationally Coordinated Program (of highway RD&T) |
| NCSA | National Center for Statistics and Analysis (NHTSA) |
| NCSL | National Conference of State Legislatures |
| NCUTLO | National Committee on Uniform Traffic Laws and Ordinances |
| NCWM | National Conference on Weights and Measures |
| NDR | National Drivers Register |
| NDT | Non-Destructive Testing |
| NEMA | National Electrical Manufacturers Association |
| NEPA | National Environmental Policy Act (1969) |
| NGA | National Governors' Association |
| NGRS | National Geodetic Reference System |
| NGV | Natural Gas Vehicle |
| NHI | National Highway Institute |
| NHIPS | National Highway Inventory and Performance Study |
| NHPN | National Highway Planning Network |
| NHS | National Highway System |
| NHTSA | National Highway Traffic Safety Administration |
| NIMC | National Incident Management Coalition |
| NIMS | National Information Management System (SHRP = NPDB) |
| NITL | National Industrial Transportation League |
| NITS | National Intercity/Intercounty Travel Survey |
| NLC | National League of Cities |
| NMCAC | National Motor Carrier Advisory Committee |
| NMT | Nonmotorized Transport |
| NOx | Nitrogen Oxides |
| NPDB | National Pavement Data Base (SHRP) |
| NPRM | Notice of Proposed Rulemaking |
| NPTC | National Private Truck Council |
| NPTS | Nationwide Personal Transportation Study |
| NQI | National Quality Initiative |
| NRC | National Research Council |
| NSC | National Safety Council |
| NSDI | National Spatial Data Infrastructure |
| NSMA | National Scale Manufacturers Association |
| NSPE | National Society of Professional Engineers |
| NTACS | Nationwide Truck Activity and Commodity Survey |
| NTDB | National Traffic Data Base (SHRP) |
| NTIA | National Telecommunications and Information Administration |
| NTIS | National Technical Information Service |
| NTP | National Transportation Policy |
| NTS | National Travel Survey |
| NTSB | National Transportation Safety Board |
| NTSC | National Transportation Systems Center (was TSC) |
| NTSPS | National Transportation Strategic Planning Study |
| NTTIS | National Truck Trip Information Survey |
| NVF | New Vehicle Fleet |
| NVPP | National Vehicle Population Profile (Polk) |
| O/D | Origin/Destination |
| OBC | On Board Computer |
| OFE | Other Freeway and Expressway |
| OHIM | Office of Highway Information Management |
| OOIDA | Owner-Operator Independent Drivers Association |
| OOS | Out of Service |
| OPA | Other Principal Arterial |
| OST | Office of Secretary of Transportation |
| P | Terminal Serviceability |
| P&R | Planning and Research |
| PAR | Police Accident Report |
| PAS | Principal Arterial System |
| PATH | Program on Advanced Technology for the Highway |
| PC | Passenger Car |
| PCA | Portland Cement Association |
| PCC | Portland Cement Concrete |
| PCE | PC Equivalent |
| PCI | Pavement Condition Index |
| PCPH | Passenger Cars Per Hour |
| PCPHPL | Passenger Cars Per Hour Per Lane |
| PCR | Pavement Condition Rating |
| PDC | Portable Data Carrier (smart tag) |
| PFA | Pedestrian Federation of America |
| PHF | Peak Hour Factor |
| PI | Principal Investigator |
| PIARC | Permanent International Association of Road Congresses |
| PIERS | Port Import/Export Report Service |
| PIH | Pan-American Institute of Highways |
| PL | Performance Level |
| PM- 10 | Particulate Matter under 10 microns |
| PMCG | Pavement Management Coordinating Group |
| PMS | Pavement Management System |
| PMT | Person Miles of Travel |
| POD | Plain Old Driving |
| POE | Port of Entry |
| PPA | Project Plan Agreement |
| PR | Procurement Request |
| PRM | Proposed Rulemaking |
| PS&E | Plans, Specifications, and Estimates |
| PS/C | Prestressed Concrete |
| PSR | Pavement Serviceability Rating |
| PSU | Primary Sampling Unit |
| PTC | Permanent Traffic Counter |
| PTF | Pavement Testing Facility |
| PTI | Pennsylvania Transportation Institute |
| PTMS | Public Transportation Management System |
| PTRC | Planning and Transport Research and Computation |
| PUD | Planned Unit Development |
| PWIM | Portable WIM |
| Pt | Terminal Serviceability index (asphalt) |
| Q | Traffic volume |
| R&D | Research and Development |
| R&R | Restoration and Rehabilitation |
| RB | Rigid Body |
| RCI | Roadway Congestion Index |
| RCOC | Regional Coordinating Office Contractor (SHRP) |
| RCU | Roadside Communicator Unit |
| RD&T | Research, Development, and Technology |
| RD&T2 | RD&T Transfer |
| RDF | Reliability Design Factor |
| RDS | Radio Data System |
| RDSS | Radio Determination Satellite Services |
| RDT&E | Research, Development, Test, and Evaluation |
| RIMS | Regional Information Management System (SHRP) |
| RIN | Regulatory Identification Number |
| ROW | Right of Way |
| RQCS | Reference Quarter Car Simulation |
| RRI | Reference Roughness Index |
| RSPA | Research and Special Programs Administration |
| RT | Right Turn |
| RTAP | Rural Technical Assistance Program (now LTAP) |
| RTCC | Research and Technology Coordinating Committee |
| RTCG | Research and Technology Coordinating Group |
| RTDB | Regional Traffic Data Base (LTPP) |
| RTEB | Research and Technology Executive Board |
| RTI | Road Transport Informatics |
| RTOR | Right Turn On Red |
| RTP | Regional Transportation Plan |
| RTPC | Research and Technology Program Committee |
| RTRRM | Response Type Road Roughness Meter |
| RVIA | Recreation Vehicle Industry Association |
| RWIM | Roadway WIM |
| RWIS | Road Weather Information Systems |
| SAC | Suburban Activity Center |
| SAE | Society of Automotive Engineers |
| SASHTO | Southeastern Association of State Highway and Transportation Officials |
| SAW | Surface Acoustic Wave |
| SBIR | Small Business Innovation Research |
| SCM | State, County, and Municipal |
| SCOP | Standing Committee on Planning (AASHTO) |
| SEB | Stateline Entry Beacon |
| SEE | Social, Economic, and Environmental factors |
| SF | Service Flow Rate, vph |
| SFL | Service Flow Rate per Lane, vphpl |
| SHA | State Highway Agency |
| SHAWS | Safety Hazard Advance Warning System |
| SHRP | Strategic Highway Research Program |
| SHV | Specialized Hauling Vehicle |
| SIP | State Implementation Plat |
| SMS | Safety Management System |
| SMS | Space Mean Speed (harmonic average) |
| SN | Structural Number |
| SN | Asphalt strength |
| SNPRM | Supplemental NPRM |
| SOP | State of the Practice |
| SOW | Statement of Work |
| SP&R | State Planning and Research |
| SPS | Special Pavement Studies |
| SRO | Site Specific/Related/Other (SHRP code) |
| SSO | Single State Only |
| STA | State Transportation Agency |
| STAA | Surface Transportation Assistance Act (1982) |
| STAPPA | State and Territorial Air Pollution Program Administrators |
| STH | State Highway |
| STIP | Statewide Transportation Improvement Program |
| STP | Surface Transportation Program |
| STPP | Surface Transportation Policy Project |
| STRS | Strategic Transportation Research Study |
| STT | Single Trailer Truck |
| SU | Single-Unit truck |
| SVRD | Single-Vehicle Roadway Departure (accident) |
| SWIM | Slow speed WIM |
| T&E | Test and Evaluation |
| T-factor | Truck percent in DHV |
| T/L | Traffic/Load |
| T2 | Technology Transfer |
| TAC | Transportation Association of Canada |
| TAD | Traffic Accident Data |
| TAR | Transportation Acquisition Regulation |
| TAZ | Traffic Analysis Zone |
| TCC | Transportation Computer Center |
| TCDH | Traffic Control Devices Handbook |
| TCM | Transportation Control Measures |
| TCP | Traffic Control Plan |
| TDB | Traffic Data Base (SHRP) |
| TDC | Traffic Data Collection |
| TDC | Travel Data Center |
| TDM | Transportation Demand Management |
| TFCU | Transportation Federal Credit Union |
| TPHRC | Turner-Fairbank Highway Research Center |
| TFT | Tractor Full-Trailer |
| THS | Territorial Highway System |
| TIA | Traffic Impact Analysis |
| TIA | Telecommunications Industries Association |
| TIPA | Trucks Involved in Fatal Accidents (UMTRI) |
| TIGER | Topologically Integrated Geographic Encoding & Referencing |
| TIN | Traffic Information Network |
| TIP | Trucking Industry Profile (Polk) |
| TIUS | Truck Inventory and Use Study |
| TL | Truckload |
| TMA | Transportation Management Area |
| TMC | Traffic Management Center |
| TMDS | Traffic Monitoring Data Software |
| TMG | Traffic Monitoring Guide |
| TMS | Time Mean Speed (arithmetic average) |
| TOD | Time of Day |
| TOFC | Trailer-on-flatcar |
| TONS | Transportation Office Network System |
| TRADAS | Traffic Data System (Chaparral) |
| TRB | Transportation Research Board (of the NRC) |
| TRDF | Texas Research and Development Foundation |
| TRF | Transportation Research Forum |
| TRI | Trucking Research Institute (ATA) |
| TRIP | The Road Information Program |
| TRIS | Transportation Research Information Services |
| TRO | Travel Reduction Ordinance |
| TRRL | Transportation Road Research Laboratory |
| TSC | Transportation Systems Center (Now NTSC) |
| TSM | Transportation System Management |
| TST | Tractor Semi-Trailer |
| TTI | Texas Transportation Institute |
| TVT | Traffic Volume Trends |
| TWC | Two-Way Communication |
| TWS | Truck Weight Study |
| UA | Urbanized Area |
| UBOA | United Bus Owners of America |
| UCBITS | University of CA Berkeley Institute of Transportation Studies |
| UIIA | Uniform Intermodal Interchange Agreement |
| UMTA | Urban Mass Transportation Administration (now FTA) |
| UMTRI | University of Michigan Transportation Research Institute |
| USCC | United States Chamber of Commerce |
| UTC | Urban Traffic Control |
| UTCS | UTC System |
| UTPS | Urban Transportation Planning System |
| V | Hourly volume, vph or vphpl |
| V | Design speed |
| V/C | Volume/Capacity |
| V/SF | Volume/Service Flow |
| VAN | Value Added Network |
| VE | Value Engineering |
| VHD | Vehicle-hours of delay |
| VHT | Vehicle-Hours of Travel |
| VIDS | Video Incident Detection System |
| VIN | Vehicle Identification Number |
| VIP | Video Image Processing |
| VKT | Vehicle-Kilometers of Travel |
| VM | Vehicle-Miles |
| VMS | Variable Message Sign |
| VMT | Vehicle-Miles Traveled/of Travel |
| VO | Vehicle Occupancy |
| VOC | Volatile Organic Compounds |
| VPD | Vehicles Per Day |
| VPH | Vehicles Per Hour |
| VPHPL | Vehicles Per Hour Per Lane |
| VRC | Vehicle/Roadside Communications |
| VS | Vehicle Speed |
| VSC | Variable Speed Control |
| VTC | Volume to Capacity |
| WASHTO | Western Association of State Highway and Transportation Officials |
| WAVM | Wide-Area Vehicle Monitoring |
| WCTR | World Conference on Transport Research |
| WES | Waterways Experiment Station |
| WET | Wetland Evaluation Technique |
| WHI | Western Highway Institute |
| WIM | Weigh-In-Motion |
| WS | Weigh Station |
| ZAC | Zone Access Control |
| ZEV | Zero Emission Vehicle |
