Doubtless of little concern to responsible drivers, it's nevertheless worth noting that speed cameras along the Surrey stretch of the M25 are now being used to enforce speed limits, having only previously been used for traffic management.
The cameras, which are positioned behind the electronic speed signs on overhead gantries, were installed in the 1990s and later upgraded in 2009 enabling them to enforce speed limits.
It is only now that the decision has finally been taken by the Surrey Safety Camera Partnership (comprising Surrey County Council, Surrey Police, the Highways Agency and Her Majesty's Court Service) to bring the enforcement function into immediate effect.
