The Effects of Speed Enforcement with Mobile Radar on Speed and Accidents: An Evaluation Study on Rural Roads in the Dutch Province Friesland

Researchers conducted an evaluation study to determine the effects of targeted speed enforcement on speed and road accidents. The evaluated speed enforcement project was conducted in the Friesland province, located in the northern part of the Netherlands. Enforcement was mainly done through mobile radar and focused on rural non-motorway roads. Publicity and information supported the enforcement activities. The evaluation study covered a period of 5 years of enforcement. The speed data of these 5 years and the year preceding the enforcement project showed a significant decrease in mean speed and the percentage speed limit violators over time. The largest decrease was observed in the first year of the enforcement project and in the fourth year of the project, when the enforcement effort was further intensified. Researchers found similar decreases in speeding at both the enforced roads and at the nearby comparison roads that were not subjected to the targeted speed enforcement project, which may be explained by spillover effects. The best estimate for the safety effect of the enforcement project is a reduction of 21% in both the number of injury accidents and the number of serious casualties. This was based on comparing the number of accidents/casualties during the enforcement project (5 years) and the eight preceding years on the enforced roads and at all other roads in the rural areas of this province.


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  • Accession Number: 01014859
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 7 2005 6:23PM