AMOUNT AND MOTIVATION OF RED LIGHT VIOLATIONS AT RAMP METERS

Red light violations (RLV) at ramp meters undermine the purpose of controlling the number of vehicles entering a freeway and the goal of dispersing platoons of vehicles. The effectiveness of ramp metering systems is assumed to decreases with a growing rate of RLV.Therefore the goal of the study was to examine the types of RLV and the causes that provoke them. It was found, that the most important influence is the variation of the length of the red interval. Most of the results can be transferred to ramp metering in general. Furthermore a high rate of false alarm of the automatic RLV-detection was revealed and examined. Recommendations for the examined entrances are given.