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| ENV | Enhanced Night Visibility |
| FHWA | Federal Highway Administration |
| GES | General Estimates System |
| GDP | Gross Domestic Product |
| NASS | National Automotive Sampling System |
| PDO | property damage only |
| VDOT | Virginia Department of Transportation |
| VTRC | Virginia Transportation Research Council |
| VES | vision enhancement system |
| three UV–A + HLB | three UV–A headlamps together with halogen low beam |
| five UV–A + HLB | five UV–A headlamps together with halogen low beam |
| HLB | halogen (i.e., tungsten-halogen) low beam |
| Hybrid UV–A + HLB | hybrid UV–A/visible output together with halogen low beam |
| IR–TIS | infrared thermal imaging system |
| UV–A | ultraviolet A (wavelength 315 to 400 nanometers) |
| b | constant |
| CMF | crash modification factor |
| CR | crash rate |
| f | coefficient of friction |
| G | grade |
| m | constant |
| S | stopping distance |
| t | time between perception and reaction |
| u | velocity |
| x | year |
| y | forecast quantity |
| ft | feet |
| km | kilometers |
| lf | linear feet |
| lm | linear meter |
| m | meters |
| mi | miles |
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