| AADT | Average Annual Daily Traffic |
| ADT | Annual Daily Traffic |
| DOT | Department of Transportation |
| FARS | Fatality Analysis Reporting System |
| FFY | Federal Fiscal Year |
| FY | Fiscal Year |
| FHWA | Federal Highway Administration |
| GIS | Geographic Information System |
| GPS | Global Positioning System |
| HRRRP | High Risk Rural Roads Program |
| HSIP | Highway Safety Improvement Program |
| LTAP | Local Technical Assistance Program |
| MPO | Metropolitan Planning Organization |
| NACo | National Association of Counties |
| NHTSA | National Highway Traffic Safety Administration |
| RPO | Regional Planning Organization |
| RSA | Road Safety Audit/Assessment |
| SAFETEA-LU | Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users |
| SAMS | Safety Analysis Management System |
| SHSP | Strategic Highway Safety Plan |
| STIP | Statewide Transportation Improvement Program |
| STP | Surface Transportation Program |
| TraCS | Traffic and Criminal Software |
| USDOT | United States Department of Transportation |
| VMT | Vehicle Miles Traveled |
| TIP | Transportation Improvement Program |
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