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Speed Limits: Cameras

Asked by Jim McMahonLabour (Co-op)Department for TransportTabled Answered 5 December 2025UIN 95731

The question

To ask the Secretary of State for Transport, what assessment has been made of the potential impact of average speed cameras on the number of accidents and casualties.

Answered by Lilian Greenwood

A 2016 study conducted by the RAC Foundation in partnership with Road Safety Analysis examined 50 Average Speed Camera (ASC) sites across Great Britain.

After adjusting for factors such as regression to the mean and national casualty trends, the analysis found:

  • 36.4% reduction in fatal and serious collisions (KSI)
  • 16% reduction in all injury collisions

The full report is available at

Average_speed_camera_effectiveness_Owen_Ursachi_Allsop_September_2016.pdf

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