[holding answer 9 December 2008]: The Department has made the following estimates of vehicle activated signs and fixed speed cameras.
Date of estimate Measure Cost (£) 23 April 2007 Vehicle activated sign 17,000 23 April 2007 Fixed speed camera 40,000 1 This excluded provision of an electrical supply (which can be relatively significant in rural locations).
Time over distance cameras cover a length of road, rather than a particular spot as with fixed speed cameras. The cost per kilometre of installing a time over distance camera system depends on a number of variables including the number of junctions present and the road environment. At present only one supplier has a model type approved for enforcement, but type approval is ongoing for a further three systems, including two from new suppliers.
We do not have any estimate for the average cost of a time over distance camera system.