| Vehicle contributory factor | Severity of accident | Total | ||
| Fatal | Serious | Slight | ||
| Inadequate or no lights | 0 | 2 | 4 | 6 |
| Tyre blown out before impact | 0 | 6 | 17 | 23 |
| Defective body work | 0 | 5 | 6 | 11 |
| Defective steering | 0 | 0 | 1 | 1 |
| Defective brake | 7 | 29 | 76 | 112 |
| Defective lights: front | 0 | 0 | 0 | 0 |
| Defective lights: rear | 0 | 0 | 1 | 1 |
| Defective lights: brake | 0 | 0 | 0 | 0 |
| Defective lights: indicator | 0 | 0 | 1 | 1 |
| Defective vision: glass | 0 | 0 | 1 | 1 |
| Defective vision: windscreen wiper | 0 | 0 | 0 | 0 |
| Defective vision: rear view mirror | 0 | 0 | 0 | 0 |
| Defective suspension: front or rear | 0 | 2 | 2 | 4 |
| Defective load: insecure | 0 | 2 | 4 | 6 |
| Defective load: apparent overload | 2 | 0 | 1 | 3 |
| Defective load: dangerous projection | 0 | 0 | 0 | 0 |
| Defective or illegal tyre | 2 | 9 | 10 | 21 |
| Broken down with hazard warning lights unlit | 0 | 3 | 10 | 13 |
| Vehicle not attended by driver rolling down | 0 | 0 | 2 | 2 |
| Unidentified vehicle (hit-and-run) | 0 | 16 | 74 | 90 |
| Other vehicle factor | 5 | 93 | 354 | 452 |