The Highways Agency have been testing new infra-red cameras on a stretch of the M25 in Kent and Surrey where the motorway is being widened.
The “smart motorway” widening scheme, from junctions 5 to 7 between Sevenoaks and Redhill, means the hard shoulder will now be used as a permanent traffic lane.
Regularly spaced emergency refuge areas have been provided and CCTV cameras installed so the Highways Agency can spot incidents.