Within-area effects of adding bright lamps for 24 hours, darkness and daylight when modelled using the number of bright lamps
| Within MSOA model coefficient for 100 bright lamps added | Within MSOA model estimate SE | Median RTC increase for 274 lamps replaced (%) | Lower confidence limit of the increase (%) | Upper confidence limit of the increase (%) | |
| 24 hours | 0.0366 | 0.0159 | 11 | 2 | 20 |
| Darkness | 0.0549 | 0.0242 | 16 | 2 | 32 |
| Daylight | 0.0395 | 0.0193 | 11 | 0 | 24 |
The percentage increases are the effect on the RTC rate occurring for a 274 increase (the mean) in the number of bright lamps.
MSOA, Middle Layer Super Output Area; RTC, road traffic collision.