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Title:

Measuring Safety Performance at Roundabouts Using Videotaped Vehicle Tracking Data

Accession Number:

01123220

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

A low cost experimental procedure is presented for videotaping vehicle tracking data at a given roundabout location. These data are examined frame by frame to extract individual vehicle position and time as it progresses along its path. Accuracy of the traffic estimates are established by comparing vehicle speed profiles from the vehicle tracking data with speed profiles obtained independently using a radar speed gun at the same roundabout location. The vehicle tracking data was used to estimate safety performance at different segments of the roundabout using different indicators, such as, time to crash, deceleration rate to avoid the crash, crash potential index that incorporates the braking capability of individual vehicles, number and exposure time in conflict. Differences in safety performance are discussed with respect to the type of indicator used, assumed traffic inputs and differences in roundabout geometry. The results of this study provide meaningful experimental indicators of potential real-time safety problems at different roundabout locations subject to behavioral driver responses to different traffic conditions.

Monograph Accession #:

01120148

Report/Paper Numbers:

09-1242

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Guido, Giuseppe Piero
Saccomanno, Frank F
Astarita, Vittorio
Vitale, Alessandro

Pagination:

18p

Publication Date:

2009

Conference:

Transportation Research Board 88th Annual Meeting

Location: Washington DC, United States
Date: 2009-1-11 to 2009-1-15
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures (10) ; References (12) ; Tables (2)

Uncontrolled Terms:

Safety performance

Subject Areas:

Data and Information Technology; Highways; Safety and Human Factors; I82: Accidents and Transport Infrastructure

Source Data:

Transportation Research Board Annual Meeting 2009 Paper #09-1242

Files:

TRIS, TRB

Created Date:

Jan 30 2009 5:27PM