This measure is closely related to another CIVITAS measure that included a Road Safety Pact and the installation of speed radar control. The impact evaluation of the two measures was integrated.
The perceived security increased after the implementation of the measure, even when this perception was already high before the CIVITAS project started: From 6.1 out of 10 before, to 6.7 after. The perception of security also increased among bicycle users. Before the implementation 68% believed that the city was safe for cyclists, while after the implementation this proportion has reached 70 percent.
In the 30 kilometre zones a speed reduction was measured, between 8 to 3 km/h during peak hours depending on the area of implementation. Also, significant reductions in the number of deaths and injured people were accounted in all neighbourhoods, ranging from a 14% reduction in the radar system affected area to an 11 percent, 7 percent and 1 percent respectively in the 3 implemented 30-km-zones.
Moreover, results from the evaluation confirmed the suitability of each approach to their corresponding context: while 30-km-zones provided further improvements in residential areas where traffic speeds were already low; radar systems are more suitable for main arterial streets where traffic speeds are high.