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Title:

Collision Experience at Dual-left-turn Lane versus Single-left-turn Lane Permissive and Exclusive Operation
Cover of Collision Experience at Dual-left-turn Lane versus Single-left-turn Lane Permissive and Exclusive Operation

Accession Number:

01321682

Record Type:

Component

Availability:

Institute of Transportation Engineers

1627 Eye Street, NW, Suite 600
Washington, DC 20006 USA

Abstract:

This investigation compares collisions at intersections with permissive-and-exclusive left-turn arrow operation. Three (3) intersections included dual-left-turn lanes in only one direction and three (3) intersections included single-left-turn lanes in both directions. Seventeen years of data were analyzed. The analyses of the collision experience in the City of Scottsdale, Arizona, USA reveals that there is a statistical significant difference in the percentage of collisions involving left-turning vehicles and the left-turn collision rates between permissive-and-exclusive left-turn arrows with dual-left-turn lanes in only one direction, and permissive-and-exclusive left-turn arrows with single-left-turn lanes in both directions. For both collision measures, the intersections with permissive-and-exclusive left-turn arrows with dual-left-turn lanes in only one direction experienced more collisions than the intersections with permissive-and-exclusive left-turn arrows with single-left-turn lanes in both directions. Of greatest importance are left-turn-head-on collisions - the most critical types of left-turn collisions. The mean left-turn-head-on collision rate at intersections with permissive-and-exclusive left-turn arrows with dual left-turn lanes in only one direction was discovered to be approximately three times the mean collision rate at intersections with permissive-and-exclusive left-turn arrows with single left-turn lanes in both directions.

Monograph Accession #:

01174676

Language:

English

Corporate Authors:

Institute of Transportation Engineers

1627 Eye Street, NW, Suite 600
Washington, DC 20006 USA

Authors:

Basha, Paul E

Pagination:

19p

Publication Date:

2010

Conference:

ITE 2010 Annual Meeting and Exhibit

Location: Vancouver , Canada
Date: 2010-8-8 to 2010-8-11
Sponsors: Institute of Transportation Engineers

Media Type:

Web

Features:

Figures (4) ; References; Tables (18)

Geographic Terms:

Subject Areas:

Highways; Operations and Traffic Management; I80: Accident Studies

Source Data:

Conference Paper AB10H2801

Files:

TRIS

Last Modified:

Nov 30 2010 7:49AM