The speed limit experiments on public roads in Finland

The speed-limit experiments in Finland continued from 1962 to 1978.A summary of the resullts of these experiments is presented in this publication. In the 1960's temporary general speed limits were applied several times.During 1969-1973 experiments with recommended road section speeds and after 1973 with compulsory speed-limits were carried out.The last mentioned experiment was extensive even by international standards.The investigations proved that the number of accidents decreased the more the more the speed limits managed to reduce the speeds, which was a function of the relative level of the speed limit.Too high a speed limit could also raise the level of speeds and increase the number of accidents.This was the case for instance in adverse weather conditions on slippery road surfaces.Alternative goals for the speed limit system are presented and the decision making concerning the speed limits reviewed.