| Vehicle contributory factor | Severity of accident | Total | ||
| Fatal | Serious | Slight | ||
| Inadequate or no lights | 0 | 2 | 6 | 8 |
| Tyre blown out before impact | 0 | 5 | 16 | 21 |
| Defective body work | 0 | 1 | 7 | 8 |
| Defective steering | 0 | 4 | 10 | 14 |
| Defective brake | 10 | 38 | 74 | 122 |
| Defective lights: front | 0 | 0 | 0 | 0 |
| Defective lights: rear | 0 | 0 | 0 | 0 |
| Defective lights: brake | 0 | 3 | 0 | 3 |
| Defective lights: indicator | 0 | 1 | 1 | 2 |
| Defective vision: glass | 0 | 0 | 0 | 0 |
| Defective vision: windscreen wiper | 0 | 0 | 0 | 0 |
| Defective vision: rear view mirror | 0 | 0 | 0 | 0 |
| Defective suspension: front or rear | 0 | 0 | 3 | 3 |
| Defective load: insecure | 0 | 0 | 2 | 2 |
| Defective load: apparent overload | 1 | 0 | 3 | 4 |
| Defective load: dangerous projection | 0 | 0 | 2 | 2 |
| Defective or illegal tyre | 0 | 6 | 25 | 31 |
| Broken down with hazard warning lights unlit | 0 | 3 | 4 | 7 |
| Vehicle not attended by driver rolling down | 0 | 0 | 4 | 4 |
| Unidentified vehicle (hit-and-run) | 0 | 21 | 44 | 65 |
| Other vehicle factor | 6 | 110 | 306 | 422 |