Open AccessA Conflict Index to Assess Traffic Safety at Intersections
Author(s) -
Raghad Zeki Abdul Majeed,
Hussein A. Ewadh
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/584/1/012018
Subject(s) - intersection (aeronautics) , traffic conflict , transport engineering , index (typography) , computer science , crash , index method , engineering , business , traffic congestion , floating car data , finance , order (exchange) , world wide web , programming language
In this paper, a conflicts-based technique, using an index measure is introduced to assess traffic safety at intersections. The technique helps in identifying sites most probable to profit from safety improvement as an alternative to crashes-based analyses. As a case study, the analysis and measure of safety for 11 four-leg signalized intersections at different sites in Baghdad city, have been done independently using direct methods based on crash rate and indirect methods based on the level of conflict risk measures. A comparison is achieved between the two methods and their outputs. The study results imply that a developed method of conflicts index of signalized intersections (CISI) (based on traffic conflict frequency and severity) could serve as a viable way of measuring the safety performance of signalized intersection at urban area. CISI can be established for existing conditions at intersections as well as in evaluating different design alternatives to more accurate safety comparison and better decision-making. Application of direct and indirect method results in identifying the same sites to profit from safety improvement. In addition, the research demonstrates a promising application of CISI in; relative comparison of conflict risk at various intersections and estimating conflict risk after potential countermeasures for before-after assessment of traffic safety at intersections.