Abstract
It is expected to control traffic light safely, especially at inter-green periods because the drivers’ judgments whether pass or not at that time affect the occurrence of severe traffic conflicts. Recently, countdown-type traffic signals for vehicles that are contributory to make appropriate judgments have been installed positively in Asian countries. In this study, we conducted a questionnaire survey and observed surveys via video cameras at signalized intersections with those types of traffic signals installation in Turkey. Analyzing the effect of the traffic signal from the viewpoint of users’ consciousness, it was shown that users’ satisfaction is improved and driving rage is dropped by the countdown display. Furthermore, it was also found that start-up delay is reduced and risky behaviors at inter-green periods are decreased by the signal, but at the same time the inadequate signal parameter settings may induce risky behaviors in spite of the countdown-type traffic signal installation.
