| Environment contributory factor | Severity of accident | Total |
| Fatal |
Serious |
Slight |
| Slippery road (not related to weather) |
0 |
15 |
76 |
91 |
| Slippery road (caused by weather) |
1 |
15 |
48 |
64 |
| Low bridge |
0 |
0 |
1 |
1 |
| High wind |
0 |
4 |
6 |
10 |
| Steep hill |
0 |
1 |
8 |
9 |
| LRT level crossing |
0 |
1 |
3 |
4 |
| Vision obscured by parked vehicle |
1 |
3 |
3 |
7 |
| Vision obscured by other stationary vehicle |
1 |
1 |
11 |
13 |
| Vision obscured by bus/PLB at bus/PLB stop |
0 |
1 |
1 |
2 |
| Vision obscured by queue of traffic |
0 |
2 |
2 |
4 |
| Vision obscured by sharp corner |
0 |
1 |
3 |
4 |
| Vision obscured on approaching crest of hill |
0 |
0 |
0 |
0 |
| Vision obscured by wall or bridge structure |
0 |
0 |
3 |
3 |
| Vision obscured by tree or bushes |
0 |
1 |
5 |
6 |
| 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 |
1 |
1 |
| Vision obscured by other obstruction |
0 |
1 |
9 |
10 |
| Object or animal in road |
1 |
18 |
91 |
110 |
| Defective traffic signal |
1 |
1 |
8 |
10 |
| Potholes |
0 |
5 |
22 |
27 |
| Unreinstated trench |
0 |
1 |
7 |
8 |
| Obstructed road |
1 |
1 |
14 |
16 |
| Pedestrian negligence |
4 |
37 |
65 |
106 |