Speed cameras have mixed results
Casualty rates at some speed camera sites have worsened since their installation, figures have shown.
But some camera partnership scheme operators have reported a reduction in accidents and injuries thanks to the introduction of cameras.
The mixed picture of the effectiveness of speed cameras came as the Department for Transport (DfT) published speed camera data from schemes in England.
The information included a camera in Castle Hill, Parkestone, Poole, in Dorset, installed in 2003, where there were three serious-injury and 11 slight-injury collisions in 2009 compared with three serious and six slight collisions at the spot in 2001 and only three serious and seven slight collisions in 2002. It revealed there were nine slight-injury casualties at a camera on the A605 at Elton near Peterborough in Cambridgeshire in 2009 - the highest figures for any year since 1990.
However, it also found a camera site in Victoria Avenue in Cambridge where there was only one slight-injury accident in 2009 and only three in 2010 compared with 1997 when there were two killed or seriously-injured incidents and 16 slight-injury incidents in 1997.
So far 75 local authorities have published some or all of their information showing accident and casualty rates, as well as speeds at camera sites before and after the introduction of the cameras. But 72 local authorities have not published any data, or not enough for the effectiveness of the camera sites to be judged.
Road Safety Minister Mike Penning said: "Local residents have a right to expect that when their council spends money on speed cameras, they publish information to show whether those cameras are helping to reduce accidents or not. I hope that this information will help local people to make informed judgments about the impact cameras are having on their local roads.
"However, residents can only hold their council to account if it has made information available so I would urge those councils which have not yet published their data to do so as soon as possible."
RAC motoring strategist Adrian Tink said: "We're pleased to start seeing this type of information being issued - it's long overdue.
"But unless this information is acted upon by local authorities then it becomes a pointless exercise. We've long called for a full audit of individual speed cameras, ensuring we keep the cameras that make a difference and replace those that don't with other safety measures if needs be."