![]() ![]() High speed reduces the possibility to respond in time when necessary. This relationship is used by other Scandinavian countries and by Australian and Dutch safety engineers.Ī similar relationship is assumed in Britain, based on empirical studies by Taylor, where changes in accident numbers associated with a 1 km/h change in speed have been shown to vary between 1% and 4% for urban roads and 2.5% and 5.5% for rural roads, with the lower value reflecting good quality roads and the higher value poorer quality roads. This result has been confirmed by many before and after studies of different speed reduction measures. Assessing potential effectiveness of speed reduction measuresīased on work by Nilsson in Sweden, a change in average speed of 1 km/h will result in a change in accident numbers ranging between 2% for a 120 km/h road and 4% for a 50 km/h road. In addition, drivers driving much faster than the average driver have a higher accident risk it is not yet evident that this is also the case for the slower driver. Large speed differences at a road also increase the likelihood of an accident. Very strong relationships have been established between speed and accident risk: The general relationship holds for all speeds and all roads, but the rate of increase in accident risk varies with initial speed level and road type. individual consequencesĪ higher speed increases the likelihood of an accident. Speed is a central issue in road safety.Speed and the injury risk for different speed levels.Speed and environment speed and travel time. ![]()
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