The effect of signal coordination on intersection safety.

This paper describes an investigation into the effect of traffic signal coordination on safety and suggests a methodology by which traffic safety could be incorporated into signal coordination. Three phases were involved: a) establishment of the relationship between number of stops and rear-end accidents, b) calibration of the optimisation model (TRANSYT 7F) and c) an investigation of the effects of signal coordination on safety. The effects of 4 different signal phasing schemes were investigated for different intersection spacings and different traffic volumes. Operational costs are discussed.