An evaluation of the dilemma zone at signalized intersections using empirical traffic data in Hanoi

Abstract

This study focuses on evaluating and analyzing the “dilemma zone” at signalized intersections in Hanoi, using real-world speed survey data of vehicles on several roads in Hanoi. The dilemma zone is the area where drivers struggle to decide whether to stop or continue moving when the traffic light turns yellow, leading to the risk of running red lights. The research results show that higher vehicle speeds result in a wider dilemma zone, especially for motorcycles and on urban streets with large width. Minimizing the dilemma zone at signalized intersections can be achieved through strategies such as speed management, extending yellow duration, implementing adaptive signal control systems, and countdown timers.

Keywords: Dilemma zone, signalized intersections, traffic safety, red-light running, empirical traffic data.