Comparison of Flashing Green and Green Countdown Signals for the Non-Motorized Driver Behavior

This paper presents a comparative study on the behavior of the non-motorized driver when encountering flashing green and green countdown indicators during the traffic signal transition phase. For this study, a statistical analysis of the stop/pass decision process with flashing green and green countdown was carried out through the identification of non-motorized driver behavior. The change trend of deceleration and acceleration during the signal transition phase was used to identify the driver's decision point. Results of the analysis show that drivers of non- motorized vehicles make earlier stop/pass decisions with the green countdown indicator than with flashing green. Based on the analysis of driver's speed when approaching the stop line, as well as the proportion of passing vehicles during amber and all red indicators between the flashing green and green countdown, it can be concluded that both flashing green and green countdown signals are dangerous for non-motorized vehicles, though flashing green is more dangerous.