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Title:

Feasibility of Using Segment Speed Deceleration Events as Safety Surrogate Measures at a Series of Freeway Interchanges

Accession Number:

01590021

Record Type:

Component

Abstract:

The Virginia Department of Transportation (VDOT) is currently constructing an Active Traffic Management (ATM) system on I-66, a major commuter route into Washington, D.C.. The ATM system incorporates a variety of techniques intended to address safety and mobility through the use of intelligent transportation systems. A major goal of the system is to improve freeway safety by mitigating conflicts where traffic transitions from high speeds into congested flow. Following system activation, VDOT wants to be able to quickly assess whether the system is improving safety. The researchers examined the relationship between the frequency of mainline speed deceleration events at interchanges and crash frequency to determine whether speed deceleration events are a reliable surrogate measure for crash frequency. Travel time data from the private company INRIX was used to determine the number of speed deceleration events, and this data was combined with crash and volume data to establish a relationship between speed deceleration event and crash frequencies. Models were developed to determine relationships between speed deceleration events, vehicle-miles traveled (VMT), and frequency of rear end and sideswipe crashes. In most cases, the relationships were linear in shape. The research showed that strong relationships could be developed between speed deceleration events and total rear end and sideswipe crashes, indicating that private sector speed data could be used to derive useful safety surrogate measures for quick safety assessments. Advantages and disadvantages of using private sector speed data for safety surrogate analysis are also discussed.

Supplemental Notes:

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

Monograph Accession #:

01584066

Report/Paper Numbers:

16-2826

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Chun, PilJin
Fontaine, Michael D

Pagination:

17p

Publication Date:

2016

Conference:

Transportation Research Board 95th Annual Meeting

Location: Washington DC, United States
Date: 2016-1-10 to 2016-1-14
Sponsors: Transportation Research Board

Media Type:

Web

Features:

Figures; Photos; References (13) ; Tables

Subject Areas:

Data and Information Technology; Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control; I80: Accident Studies

Source Data:

Transportation Research Board Annual Meeting 2016 Paper #16-2826

Files:

TRIS, TRB, ATRI

Created Date:

Jan 12 2016 5:15PM