From: Effects of weather conditions, light conditions, and road lighting on vehicle speed
Weather condition | No road lighting (n = 8) | Road lighting (n = 17) | ||
---|---|---|---|---|
Mean | SD | Mean | SD | |
Clear | ||||
Darkness | 93.0 | 18.8 | 63.7 | 18.5 |
Twilight | 91.7 | 19.8 | 63.0 | 19.5 |
Daylight | 90.9 | 19.1 | 65.2 | 20.6 |
Rain | ||||
Darkness | 91.8 | 18.6 | 66.7 | 20.7 |
Twilight | 90.2 | 20.9 | 67.9 | 21.7 |
Daylight | 90.4 | 18.8 | 67.7 | 22.1 |
Snow | ||||
Darkness | 83.2 | 16.2 | 58.7 | 13.5 |
Twilight | 86.4 | 18.9 | 55.4 | 12.0 |
Daylight | 87.8 | 17.5 | 59.0 | 15.0 |