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留学生工程管理REPORT定制:DEVELOPMENT OF LEFT-TURN LA

FINAL REPORT
DEVELOPMENT OF LEFT-TURN LANE GUIDELINES FOR SIGNALIZED AND UNSIGNALIZED INTERSECTIONS
Vijayendra R. Lakkundi
Graduate Research Assistant
Brian Park, Ph.D.
Faculty Research Scientist and Research Assistant Professor of Civil Engineering
Nicholas J. Garber, Ph.D., P.E.
Faculty Research Engineer
and
Professor of Civil Engineering

Michael D. Fontaine, P.E.
Research Scientist

Virginia Transportation Research Council
(A Cooperative Organization Sponsored Jointly by the
Virginia Department of Transportation and
the University of Virginia)
In Cooperation with the U.S. Department of Transportation
Federal Highway Administration
Charlottesville, Virginia
March 2004
VTRC 04-R11
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DISCLAIMER
留学生论文网The contents of this report reflect the views of the authors, who are responsible for thefacts and the accuracy of the data presented herein. The contents do not necessarily reflect theofficial views or policies of the Virginia Department of Transportation, the CommonwealthTransportation Board, or the Federal Highway Administration. This report does not constitute astandard, specification, or regulation.Copyright 2004 by the Commonwealth of Virginia.
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ABSTRACT
It is generally accepted that the level of service (LOS) at intersections significantlyaffects the overall LOS of the road system. It is also known that the LOS at an intersection canbe adversely affected by frequently allowing left-turning vehicles to block through traffic. Inaddition, crash rates tend to be higher at intersections than on through sections of a road. Theseparation of left-turning vehicles from through traffic is therefore an important condition for thesafe and effective operation of intersections.
Existing guidelines for installing left-turn lanes have several limitations. They are mainlybased on the traffic volumes at the intersection, and they use deterministic models with fixed gapacceptance and/or left-turn maneuver times. In addition, the guidelines for left-turn lanes forunsignalized intersections and signalized intersections must be specific for the type ofntersection.
In this study, new left-turn guidelines for both unsignalized and signalized intersectionswere developed on the basis of well-validated event-based simulation programs. Guidelines forunsignalized intersections were based on the percentage of left turns blocking through vehicles,whereas the guidelines for signalized intersections were developed using a minimum left-turnvolume of either 85% left-turn capacity or LOS E delay (55 seconds/vehicle). In addition to thegeneral guidelines, a prioritization tool that can be used to prioritize candidate intersections wasdeveloped. The prioritization tool accounts for both operational and safety aspects.
INTRODUCTION
It is generally accepted that the level of service (LOS) at intersections can significantlyaffect the overall LOS of a road. It is also known that the LOS at an intersection can beadversely affected by frequently allowing the left-turning vehicles to block the through traffic.Crash rates also tend to be higher at intersections than on through sections of a road. Theseparation of left-turning vehicles from through traffic can be an important condition for the safeand effective operation of an intersection.



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