Table 10 Difference between the average speed in different weather conditions (rain, snow) and the average speed in clear weather for the same road, month, and light condition (daylight, darkness, twilight)
From: Effects of weather conditions, light conditions, and road lighting on vehicle speed
Weather | Light cond. | Road lighting | Speed − speed in clear weather conditions |
|---|---|---|---|
Rain | Darkness | No lighting | −1.5 |
Snow | Darkness | No lighting | −6.4 |
Rain | Twilight | No lighting | −1.1 |
Snow | Twilight | No lighting | −3.8 |
Rain | Daylight | No lighting | −0.7 |
Snow | Daylight | No lighting | −2.5 |
Rain | Darkness | Lighting | 0.1 |
Snow | Darkness | Lighting | −1.4 |
Rain | Twilight | Lighting | 0.0 |
Snow | Twilight | Lighting | −2.5 |
Rain | Daylight | Lighting | −0.4 |
Snow | Daylight | Lighting | −1.7 |