Speed cameras cut injuries by a quarter - RAC research
7 June 2013 Last updated at 19:54 BST
Speed cameras cut the number of serious injuries in road accidents in the areas where they are placed by an average of more than a quarter, a study suggests.
The research by the RAC Foundation was based on data from 551 fixed camera sites in nine areas of England.
Twenty one sites bucked that trend, however, with the number of injuries going up.
Richard Westcott reports.