to assist with a study into methods of detecting incidents, such as accidents, breakdowns or congestion, on the running lanes of motorways, a number of simulated incidents were organised on the boulevard peripherique in paris by the institut de recherche des transports. analysis of the traffic data collected by the transport and road research laboratory during the simulated incidents has shown that, for such a site with high flow levels, an algorithm based on the detection of slow moving or stationary vehicles was able to detect all the simulated incidents without giving any false alarms.(a)

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