Analysis for Factors of Traffic Accident Risk Factors on Separated Traffic Signal Control Focused on Geometric Features and Surrounding Environment of Intersection

Abstract

This study focuses on separated traffic signal control that separate pedestrians and vehicles, which have been confirmed to be effective in reducing traffic accidents and are being installed throughout Japan. In order to examine the conditions that would further increase the effectiveness of traffic accident reduction through the installation of such signals, we analyzed the factors that affect the number of traffic accidents caused by various conditions of separated traffic signal control. The analysis was conducted using actual traffic accident data and a negative binomial regression model for traffic accident risk assessment. As a result of this study, the main findings were: 1) different parties have different factors that affect traffic accident risk; 2) factors that reducing the traffic accident risk include shorter distance between stop lines and installing bicycle crossing lanes; and 3) factors that lessen the effect of reducing the traffic accident risk in interaction with installing separated traffic signal control include longer distance between stop lines for all accidents and vehicle accidents, and a larger population around the intersections for all accidents.