This report presents the results of surveys, conducted in Glasgow to measure the level of compliance with traffic signals at six camera sites and six control sites. Three surveys were conducted: (1) in September 1991, after camera equipment had been installed at six sites, but before any enforcement, signing or publicity; (2) in March and April 1993, after over a year of camera operation, with the issue of warning letters to drivers at the camera sites found not to be complying; and (3) in September 1994, after 16 months of camera operation with full enforcement, and the use of fixed penalty fines on drivers not complying with the signals. Observations were taken of number of red light infringements and opportunities to infringe, together with the duration and vehicle type of each infringement. Infringements and serious infringements at the camera sites were both reduced by nearly 70% between the first and second surveys, but there was little change between the second and third surveys. There was a 62% reduction of personal injury accidents from three years before the introduction of cameras to three years after; this was related to the modified behaviour observed. Accidents were also reduced at other sites nearby.
Abstract