| Code Value | Definition |
|---|---|
| 0 | Not Applicable |
| 1 | Single-Unit Truck (2- axle and GVWR more than 10,000 lbs) |
| 10 | Vehicle 10,000 pounds or less placarded for hazardous materials |
| 19 | Truck More Than 10,000 lbs, Cannot Classify |
| 2 | Single-Unit Truck (3 or more axles) |
| 20 | Bus/Large Van (seats for 9-15 occupants, including driver) |
| 21 | Bus (seats for more than 15 occupants, including driver) |
| 4 | Truck Pulling Trailer(s) |
| 5 | Truck Tractor (Bobtail) |
| 6 | Truck Tractor/Semi-Trailer |
| 7 | Truck Tractor/Double |
| 8 | Truck Tractor/Triple |
| 99 | Unknown |