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From the Archives

January 2005

Speed control and incident detection on the M25

A Controlled Motorways scheme was introduced on to the M25 in August 1995 from Junction 10 to Junction 16. This report presents an overview of the monitoring work undertaken by TRL for the Highways Agency between 1995 and 2002 describing the trends in traffic behaviour on this section. It also presents the results of a driver opinion survey, which provided a detailed understanding of how the Controlled Motorway was perceived by its users. The results of investigations into the effects of the variable speed limits on accidents, noise and air pollution are presented.

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