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Title:

Development of a New Speed-Related Proximal Indicator for Safety Assessment at Uncontrolled Intersections

Accession Number:

01628199

Record Type:

Component

Abstract:

Traffic conflict analysis has been traditionally performed using Post Encroachment Time (PET) and based on its predetermined threshold critical conflicts are identified. Identification of critical conflicts based on a time-based threshold could be misleading because drivers in a traffic stream do not always follow the posted speed limit. Moreover, PET alone can assess the probability of collision. This study is focused on proposing a new methodology to identify the conflicts in terms of criticality of resulting collision. A new proximal safety indicator has been developed by incorporating conflicting speed of through moving vehicles alongside PET. Four uncontrolled intersections have been selected from the National Capital Region (NCR) of India. A speed parameter termed as critical speed is introduced to identify the critical conflicts. It is calculated based on the concept of braking distance. In general, more critical conflicts are observed when the conflicting speed of through vehicles is high. For all the vehicle categories on two cross roads, the maximum proportion of critical conflicts is observed between right turning Heavy Vehicles (HV) and through moving Two Wheelers (2W) along the major road. The conflicting speed of through moving 2W is also observed to be the highest among all vehicle categories. Safety evaluation of such uncontrolled intersections can be carried out using the proposed indicator. It is suggested to verify the appropriateness of the proposed methodology using the crash data available for the study sites.

Supplemental Notes:

This paper was sponsored by TRB committee ANB20 Standing Committee on Safety Data, Analysis and Evaluation.

Monograph Accession #:

01618707

Report/Paper Numbers:

17-06588

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Paul, Madhumita
Ghosh, Indrajit

Pagination:

14p

Publication Date:

2017

Conference:

Transportation Research Board 96th Annual Meeting

Location: Washington DC, United States
Date: 2017-1-8 to 2017-1-12
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References (21) ; Tables

Subject Areas:

Highways; Safety and Human Factors

Source Data:

Transportation Research Board Annual Meeting 2017 Paper #17-06588

Files:

TRIS, TRB, ATRI

Created Date:

Dec 8 2016 12:41PM