The safety of MOVA traffic signal control at 'high-speed' junctions

The accident records of twenty five high-speed traffic signal junctions that had been converted from Speed Assessment (SA) or Speed Discrimination (SDE) control to MOVA with no other changes were assessed. As in an earlier study; the results showed no significant difference in the frequency of personal injury accidents between MOVA and SDE/SA control. However, the quality of the MOVA configuration data was shown to have a bearing on safety. The configured free flow speed ('cruise speed') appeared to have the greatest effect on safety. Developments to MOVA are proposed to improve the ease with which the configuration data is specified, including on-line facilities to measure cruise speeds and saturation flows. (A)