| Vehicle contributory factor | Severity of accident | Total | ||
| Fatal | Serious | Slight | ||
| Inadequate or no lights | 0 | 1 | 5 | 6 |
| Tyre blown out before impact | 0 | 6 | 12 | 18 |
| Defective body work | 2 | 6 | 11 | 19 |
| Defective steering | 0 | 1 | 1 | 2 |
| Defective brake | 1 | 27 | 54 | 82 |
| Defective lights: front | 0 | 1 | 0 | 1 |
| Defective lights: rear | 0 | 0 | 0 | 0 |
| Defective lights: brake | 0 | 0 | 0 | 0 |
| Defective lights: indicator | 0 | 0 | 0 | 0 |
| 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 | 5 | 7 |
| Defective load: insecure | 0 | 2 | 1 | 3 |
| Defective load: apparent overload | 0 | 2 | 2 | 4 |
| Defective load: dangerous projection | 0 | 0 | 1 | 1 |
| Defective or illegal tyre | 0 | 5 | 11 | 16 |
| Broken down with hazard warning lights unlit | 0 | 1 | 8 | 9 |
| Vehicle not attended by driver rolling down | 0 | 2 | 3 | 5 |
| Unidentified vehicle (hit-and-run) | 0 | 14 | 67 | 81 |
| Other vehicle factor | 12 | 80 | 323 | 415 |