Fact

Speed - What is the road safety effect of speed differences?

Not only the average speed on a road, but also differences in speed influence road safety (Aarts & Van Schagen, 2006). Firstly, roads with a large speed variance (i.e. large differences between the speeds of vehicles in for instance a 24-hour period) generally are less safe than roads with a small speed variance. Secondly, speed differences between vehicles at the same time and place are related with higher risks. Thirdly, vehicles with a higher speed than average on that road have a higher risk of a crash; vehicles driving slower than average have no higher or lower risk. 

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Updated

21 Nov 2016

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