Fig. 6From: Effects of weather conditions, light conditions, and road lighting on vehicle speedMean values of speed difference, i.e., measured average speed minus the posted speed limit, at TF stations plotted against posted speed limit (km/h) separately for roads without (“No RdLight”) and with road lighting (“RdLight”), for different light conditions (darkness, twilight, daylight), and in different weather conditions (clear weather, rain, and snow)Back to article page