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Title:

Developing a Crash-Conflict Model for Safety Performance Analysis and Estimation of Crash Modification Factors for Urban Signalized Intersections

Accession Number:

01519732

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Surrogate safety measures based on high risk vehicle interactions and traffic conflicts have been used to provide a more causal perspective on lack of safety at a given location for different road and traffic conditions. The traffic conflict approach, however, has been criticized for lacking a formal link to observational crashes, i.e., to actual safety performance, which can be viewed as being the only verification of transportation system failure from a safety perspective. Hence, a link to observed crashes provides an observational basis for the use of simulated traffic conflicts to identify sites with potential safety problems and for suggesting and evaluating cost-effective treatments. This paper presents a statistical relationship between observed crashes and simulated traffic conflicts for a range of conflict thresholds and simulation runs. Conflicts were simulated for a sample of signalized intersections from Toronto using a VISSIM microscopic traffic simulation platform. The effect of conflict threshold and number of simulation runs in applying this relationship for estimating countermeasure crash modification factors (CMFs) is discussed. The results support the view that CMFs can be estimated more reliably when an appropriate number of simulation runs and conflict thresholds are used in the calibration of the crash-conflict relationship.

Supplemental Notes:

This paper was sponsored by TRB committee ANB25 Highway Safety Performance. Alternate title: Developing Crash-Conflict Model for Safety Performance Analysis and Estimation of Crash Modification Factors for Urban Signalized Intersections

Monograph Accession #:

01503729

Report/Paper Numbers:

14-4289

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Shahdah, Usama Elrawy
Saccomanno, Frank
Persaud, Bhagwant

Pagination:

15p

Publication Date:

2014

Conference:

Transportation Research Board 93rd Annual Meeting

Location: Washington DC
Date: 2014-1-12 to 2014-1-16
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Identifier Terms:

VISSIM (Computer model)

Uncontrolled Terms:

Time to collision

Subject Areas:

Highways; Planning and Forecasting; Safety and Human Factors; I72: Traffic and Transport Planning; I82: Accidents and Transport Infrastructure

Source Data:

Transportation Research Board Annual Meeting 2014 Paper #14-4289

Files:

TRIS, TRB, ATRI

Created Date:

Jan 27 2014 3:29PM