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Related Experiment Videos

Are mobile speed cameras effective? A controlled before and after study.

S M Christie1, R A Lyons, F D Dunstan

  • 1National Public Health Service for Wales, Pontypool, Wales, UK.

Injury Prevention : Journal of the International Society for Child and Adolescent Injury Prevention
|December 25, 2003
PubMed
Summary

Mobile speed cameras significantly reduce road traffic injuries by 51% up to 500 metres, with the route-based method proving most effective for measuring this impact.

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Area of Science:

  • Traffic Safety Research
  • Public Health Interventions
  • Road Accident Analysis

Background:

  • Evaluating the effectiveness of mobile speed cameras is crucial for road safety.
  • Determining the optimal metric for assessing camera impact on traffic injuries is an ongoing challenge.

Purpose of the Study:

  • To identify the most appropriate metric for evaluating mobile speed camera effectiveness in reducing road traffic injuries.
  • To compare the efficacy of circular zones versus route-based methods in assessing camera impact.

Main Methods:

  • A controlled before-and-after study was conducted at 101 mobile speed camera sites in South Wales, UK.
  • Two methods were compared: a circular zone around the camera and a route-based method to define exposure.
  • The primary outcome measure was the rate ratio of injurious crashes at intervention and control sites.

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Main Results:

  • Mobile speed cameras reduced injurious crashes up to 500 metres, with the route-based method showing a larger effect than the circular zone method.
  • A sustained 51% reduction in injurious crashes (rate ratio 0.49) was observed up to two years post-intervention.
  • Significant reductions were noted across different times of day, speed limits (30 and 60-70 mph), and for various road user types (pedestrians, motorcyclists, car occupants).

Conclusions:

  • The route-based method is superior for measuring mobile speed camera effectiveness up to 500 metres.
  • Mobile speed cameras demonstrate a substantial and sustained impact on reducing road traffic injuries.