The DfT says its figures come from an independent report produced to evaluate the first three years of the camera scheme.
Transport Secretary Alistair Darling said: 'These figures prove cameras save lives. The number of people speeding has come down and there has been a significant reduction in deaths and injuries at camera sites'.
But the figures have been rubbished by anti-speed camera campaign groups.
Paul Smith, founder of Safe Speed, said: 'Problems arise because cameras are placed where there have been a high level of accidents over a fairly short period. When a camera is put where there has been a temporary upward blip in accidents, we should not be surprised the blip does not recur.'