Table 3
Rate ratio and number of injurious crashes prevented, by time after intervention, time of day, speed limit, and type of road user injured, 0–500 metre routes method
| No of sites* | Expected | Observed | Rate ratio (95% CI) | NP† (95% CI) | |
|---|---|---|---|---|---|
| *Number of sites contributing to this analysis. | |||||
| †Number of injurious crashes prevented per site during follow up. | |||||
| ‡Expected numbers may not sum to exactly the stated total because of rounding. | |||||
| §TWMV, two wheeled motor vehicle. | |||||
| Total all injurious crashes, all sites‡ | 101 | 357 | 174 | 0.49 (0.42 to 0.57) | 1.8 (1.5 to 2.1) |
| Time after intervention (months) | |||||
| 3–6 | 88 | 58 | 27 | 0.47 (0.31 to 0.68) | 0.3 (0.2 to 0.5) |
| 6–9 | 66 | 48 | 29 | 0.61 (0.41 to 0.87) | 0.3 (0.1 to 0.4) |
| 9–12 | 60 | 40 | 25 | 0.63 (0.41 to 0.93) | 0.2 (0.0 to 0.4) |
| 12–15 | 54 | 41 | 22 | 0.54 (0.34 to 0.82) | 0.3 (0.1 to 0.5) |
| 15–18 | 41 | 25 | 16 | 0.64 (0.36 to 1.04) | 0.2 (0.0 to 0.4) |
| 18–21 | 38 | 28 | 5 | 0.18 (0.06 to 0.42) | 0.6 (0.4 to 0.7) |
| 21–24 | 34 | 10 | 11 | 1.12 (0.56 to 2.01) | 0.0 (−0.3 to 0.1) |
| Time of day | |||||
| Day | 101 | 255 | 118 | 0.46 (0.38 to 0.56) | 1.4 (1.1 to 1.6) |
| Night | 101 | 102 | 56 | 0.55 (0.42 to 0.71) | 0.5 (0.3 to 0.6) |
| Speed limit (mph) | |||||
| 30 | 76 | 291 | 141 | 0.49 (0.42 to 0.58) | 1.9 (1.6 to 2.2) |
| 40–50 | 5 | 7 | 6 | 0.80 (0.30 to 1.75) | 0.3 (−1.1 to 1.1) |
| 60–70 | 20 | 58 | 24 | 0.41 (0.27 to 0.62) | 1.7 (1.1 to 2.1) |
| Type of road user | |||||
| Pedestrian | 101 | 118 | 26 | 0.22 (0.14 to 0.32) | 0.9 (0.8 to 1.0) |
| Pedal cyclist | 101 | 14 | 12 | 0.83 (0.43 to 1.46) | 0.0 (−0.1 to 0.1) |
| TWMV user§ | 101 | 16 | 6 | 0.37 (0.13 to 0.80) | 0.1 (0.0 to 0.1) |
| Car occupant | 101 | 219 | 106 | 0.48 (0.40 to 0.59) | 1.1 (0.9 to 1.3) |
