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Title:

Evaluation of Advanced Vehicle Detection to Reduce Sudden Braking at High-Speed Intersections

Accession Number:

01154396

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

This paper describes a study to determine whether advanced vehicle detection (AVD) installed at high-speed intersections is an effective means of reducing sudden braking that can result in rear end crashes. The study examined the effects of AVD on the proportions and the positions of vehicles caught in the decision zone (DZ) and drivers’ decisions to stop or proceed through the intersection when the light turns yellow. On approaching an intersection, the DZ begins where 90% of all drivers stop and ends where only 10% of all drivers stop when the light turns yellow. These two points are typically estimated to be 5.5 and 2.5 seconds of travel time upstream of the stop line at the posted speed limit. At the two 45 mph sites in this study, the upstream and downstream DZ boundaries were found to be 1.45 seconds and 0.81 seconds closer to the stop line than the 5.5 and 2.5 second boundaries just mentioned. At the two 50 mph sites in this study, the upstream and downstream DZ boundaries were found to be 0.71 seconds and 0.80 seconds closer to the stop line than the usual limits. The importance of these findings is that an AVD should not be programmed to extend the green time for vehicles that will not travel sufficiently far into the DZ at the upstream end, but it must be programmed to extend the green sufficiently long to allow vehicles to clear the DZ at the downstream end. Therefore, determining the proper DZ boundaries for a given site is critical to the proper calibration and effectiveness of an AVD installation.

Monograph Accession #:

01147878

Report/Paper Numbers:

10-1824

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Janson, Bruce N
Marlina, Susi
Sarchet, Richard
Retting, Richard A

Pagination:

14p

Publication Date:

2010

Conference:

Transportation Research Board 89th Annual Meeting

Location: Washington DC, United States
Date: 2010-1-10 to 2010-1-14
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures (3) ; References (11) ; Tables (6)

Uncontrolled Terms:

Hard braking; High speed intersections

Subject Areas:

Highways; Operations and Traffic Management; Planning and Forecasting; Safety and Human Factors; I72: Traffic and Transport Planning

Source Data:

Transportation Research Board Annual Meeting 2010 Paper #10-1824

Files:

TRIS, TRB

Created Date:

Jan 25 2010 10:50AM