| Environment contributory factor | Severity of accident | Total |
| Fatal |
Serious |
Slight |
| Slippery road (not related to weather) |
0 |
13 |
102 |
115 |
| Slippery road (caused by weather) |
1 |
16 |
71 |
88 |
| Low bridge |
0 |
0 |
0 |
0 |
| High wind |
0 |
2 |
0 |
2 |
| Steep hill |
0 |
1 |
10 |
11 |
| LRT level crossing |
0 |
3 |
5 |
8 |
| Vision obscured by parked vehicle |
0 |
0 |
5 |
5 |
| Vision obscured by other stationary vehicle |
0 |
3 |
2 |
5 |
| Vision obscured by bus/PLB at bus/PLB stop |
1 |
3 |
6 |
10 |
| Vision obscured by queue of traffic |
0 |
0 |
0 |
0 |
| Vision obscured by sharp corner |
0 |
1 |
1 |
2 |
| Vision obscured on approaching crest of hill |
0 |
3 |
1 |
4 |
| Vision obscured by wall or bridge structure |
0 |
0 |
1 |
1 |
| Vision obscured by tree or bushes |
0 |
0 |
4 |
4 |
| Vision obscured by bus shelter |
0 |
0 |
0 |
0 |
| Vision obscured by advertisement sign |
0 |
0 |
0 |
0 |
| Vision obscured by other street fixtures |
0 |
0 |
0 |
0 |
| Vision obscured by hawker stall |
0 |
0 |
0 |
0 |
| Vision obscured by pedestrian |
0 |
0 |
0 |
0 |
| Vision obscured by other obstruction |
0 |
1 |
5 |
6 |
| Object or animal in road |
0 |
9 |
65 |
74 |
| Defective traffic signal |
0 |
0 |
7 |
7 |
| Potholes |
0 |
9 |
22 |
31 |
| Unreinstated trench |
0 |
2 |
5 |
7 |
| Obstructed road |
1 |
0 |
10 |
11 |
| Pedestrian negligence |
5 |
17 |
38 |
60 |