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Title:

Estimation of Modified Time to Collision as Surrogate for Mid-block Crashes under Mixed Traffic Conditions
Cover of Estimation of Modified Time to Collision as Surrogate for Mid-block Crashes under Mixed Traffic Conditions

Accession Number:

01625679

Record Type:

Component

Abstract:

Quantification of safety is necessary to assess the crash risk of a road facility and evaluate the effect of implemented accident countermeasures. Traditional safety quantification procedure uses accident data, which in spite of being a direct measure of safety, has limitations such as recording errors, missing data, small sample size and reactive approach. In this context, surrogate safety measures offer flexibility to assess safety and evaluate effectiveness of countermeasures. With advancement in micro simulation models these measures can be tested on road in their planning stage and can be implemented in Collision Avoidance Warning Systems in new generation vehicles for driver support. This demands a surrogate measure that has been validated and evaluated on different roads under different conditions to estimate conflicts with minimum error. The present study proposes a methodology to identify possible conflicts using width characteristics of vehicles and estimate an existing surrogate measure-Modified Time to Collision (MTTC)-under mixed traffic conditions with due consideration of all vehicle types and their characteristics. The proposed methodology has been implemented in a real case study using a micro simulation model and has been evaluated against real world accident data. Sensitivity of MTTC threshold is studied to arrive at an appropriate critical threshold. Results indicate a strong temporal and spatial correlation between the estimated conflicts and real accidents for a considerable time of the day. The study considers diverse driver and vehicle characteristics. The limitations of MTTC as a surrogate for mid-block crashes has been studied and discussed.

Supplemental Notes:

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

Monograph Accession #:

01618707

Report/Paper Numbers:

17-04012

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Charly, Anna
Mathew, Tom V

Pagination:

17p

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 (13) ; Tables

Uncontrolled Terms:

Time to collision

Subject Areas:

Highways; Safety and Human Factors

Source Data:

Transportation Research Board Annual Meeting 2017 Paper #17-04012

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Dec 8 2016 11:32AM