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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Tran Quang Vuong
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DOI:10.17265/2328-2142/2017.04.004
Affiliation(s)
University of Transport and Communications, Campus in Ho Chi Minh City, Ho Chi Minh City, Vietnam
ABSTRACT
In developing countries, the numbers of traffic accidents, injuries and fatalities are very high and tend to increase at signalized
intersections. For example, in Ho Chi Minh City (HCMC) of Vietnam, the number of
accidents at signalized intersections accounted for 45% of the total accidents
at all the intersections. This fact leads to strong necessity for analyzing
traffic safety at signalized intersections. Nevertheless, the historical
accident data in HCMC is not available for deep analysis, this study uses video
cameras to capture and analyze conflicts that potentially lead to accidents
using TCT (traffic conflict technique). Conflict severity identification is one
of the most significant steps to evaluate traffic safety at signalized
intersections using TCT. Six zones (serious conflict, common conflict,
non-conflict, highest potential serious conflict, potential serious conflict,
and potential common conflict) are explored in this study to clarify conflict
severity. This result is based on being the cut off value between serious
conflicts and common conflicts, according to 85% cumulative frequency of TTC (time
to collision) and CS (conflict speed) under 3,050 samples size which were observed
at 10 signalized intersections during August-November, 2014. Such a deep understanding is a scientific basis to study how to
apply TCT to evaluate traffic safety at signalized intersections under mixed
traffic conditions.
KEYWORDS
Traffic conflict technique, traffic safety, signalized intersections, traffic conflict severity, mixed traffic condition.
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