Experiments with differentiated speed limits during the years 1968-1972

Results from experiments with differentiated speed limits carried out in Sweden between the years 1968 and 1972 are reported. The speeds involved herein include a general speed limit of 70 km/h on two lane roads outside built-up areas and a 110 km/h limit for motorways and good standard roads in north Sweden with low traffic density. The methods of analyses means that the accident development was studied on the same roads both before and after the change in speed limits.