| Number | Heading | Description |
|---|---|---|
| Light Duty Vehicles: Passenger vehicle (FHWA Vehicle Class 1, Class 2) |
PC-C | Passenger cars and motorcycles |
| Light Duty Vehicles: Passenger vehicle (FHWA Vehicle Class 3) |
2a4t | Pickup truck/sports utility, four-tire vehicles |
| Medium Duty Vehicles: Single unit truck (FHWA Vehicle Class 4) |
Bus | Full size school and transit buses |
| Medium Duty Vehicles: Single unit truck (FHWA Vehicle Class 5) |
2a6t | Two-axle six tire, delivery type van or heavy duty pickup |
| Medium Duty Vehicles: Single unit truck (FHWA Vehicle Class 6) |
3aSU | Three-axle single unit, short-haul delivery truck, dump truck |
| Medium Duty Vehicles: Single unit truck (FHWA Vehicle Class 7) |
4aSU | Four-axle single unit, short-haul delivery truck, concrete truck |
| Heavy Duty Vehicles: Tractor-trailer truck (FHWA Vehicle Class 8) |
4aST | Less than five-axle tractor/single trailer, medium-haul delivery |
| Heavy Duty Vehicles: Tractor-trailer truck (FHWA Vehicle Class 9) |
5aST | Five-axle tractor/single trailer, '18 Wheeler' |
| Heavy Duty Vehicles: Tractor-trailer truck (FHWA Vehicle Class 10) |
6aST | More than five-axle tractor/single trailer, tanker truck, logging truck |
| Heavy Duty Vehicles: Tractor-trailer truck (FHWA Vehicle Class 11) |
5aMT | Less than six-axle multi trailer truck |
| Heavy Duty Vehicles: Tractor-trailer truck (FHWA Vehicle Class 12) |
6aMT | Six-axle multi trailer truck |
| Heavy Duty Vehicles: Tractor-trailer truck (FHWA Vehicle Class 13) |
7aMT | More than six-axle multi trailer truck |
