This study investigated time and distance halo effects of mobile overt speed cameras. Electronic data loggers were used to accurately record each vehicle’s speed as it crossed a set of induction loops buried in the road. Speeds were compared with baseline measures for each data collection point and across points. The first hypothesis was supported. There was a significant 6 kilometres per hour reduction in mean and a 7 kilometres per hour reduction in 85th percentile vehicle speeds, and the number of vehicles exceeding the speed limit fell from 53 per cent to 16 per cent immediately adjacent to the operational camera. However, these effects had completely disappeared by 1,500 metres downstream. Upstream halos were negligible. There was no time halo effect. In conclusion, this research found that mobile overt speed cameras are effective in reducing vehicle speeds. However, the reduction in speed is only for a relatively short distance and in a one-off trial only occurs while the camera is in operation. (a) For the covering entry of this conference, please see ITRD abstract no. E214057. Printed volume contains peer-reviewed papers. CD-ROM contains submitted papers.
Samenvatting