corroborative evidence. UK deployment The first red light cameras were introduced in an initiative in the City of Nottingham in 1988 following a triple fatal road traffic accident at a traffic light controlled road junction. The Department of Transport took an interest, and sponsored a trial involving the Home Office and the Metropolitan Police. The operational base was at the West London Traffic Unit. Roger Reynolds, a Police Sergeant (later to become President of the Royal Photographic Society) undertook operational trials of the equipment and, by adjusting the camera controls, managed to use colour film for the first time replacing black and white film. Reynolds made the first successful use of the Gatso camera on the A316 road at Twickenham Bridge in 1992. The first controlled junction was at the Hanger Lane Gyratory, on the A406 North Circular Road southbound at its junction with the A40 Western Avenue. This junction was then followed by the A501 Marylebone Road at its junction with Gloucester Place. A further installation was commissioned on the eastbound A40 at its junction with Long Lane (Hillingdon). After the camera units were deployed there was a significant reduction in accident rates in their vicinity. The Police Camera team developed paper handling systems using (then) current process and later laid down systems to incorporate conditional offer fixed penalty systems. The processes developed by the team formed the basis of similar systems, used and modified by other police forces. Also a member of the Team travelled to Hong Kong and assisted in the introduction of cameras there. Speed cameras were also evaluated by the Metropolitan police team for their speed limit enforcement capabilities before the system was rolled out. The linear markings suggested by the team are now an integral part of the camera site marking. The team that introduced the system and the engineers of the Department of Transport, as road safety specialists, were keen to use the equipment to change driver behaviour and thus improve road safety. However strategic control of cameras later moved to the safety camera partnerships. prosecution thresholds. Many UK police forces apply the enforcement threshold guidelines recommended by the National Police Chiefs' Council. Gatso cameras in the UK previously had deployment requirements, in common with all fixed speed camera types operated in the UK by safety camera partnerships (SCPs) under the National Safety Camera Programme (NSCP). They had to be marked, made visible,