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Mathematical Problems in Engineering
Volume 2014, Article ID 671589, 10 pages
Research Article

Effects of Countdown Signals in Red Phase on Drivers: A Comparative Study between Japan and Turkey

Institute of Transportation Engineering, Tsinghua University, Beijing 100084, China

Received 7 August 2014; Revised 15 November 2014; Accepted 19 November 2014; Published 30 December 2014

Academic Editor: Yingwei Zhang

Copyright © 2014 Ke Yu and Huapu Lu. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Countdown signals can be found in many countries; however, there are only a few researches that study the impact of the signals on driver behavior. In this study, we focus particularly on the behavior of drivers reacting to countdown signals when the signal shifted from red to green. Although the countdown signal can reduce startup delay, it also causes drivers premature start. This paper determines the factors influencing the behaviors of drivers on startup delay, premature start, and headway due to countdown signals. The analysis results are compared between Japan and Turkey. From our findings, we propose countermeasures to reduce the problems caused by the countdown signals which can be a guideline for implementation or modification of countdown-signalized intersections in many countries in order to increase safety of both drivers and pedestrians as well as drivers’ satisfactions.