OPERATIONAL EFFECTS OF TWO-WAY LEFT-TURN LANES ON TWO-WAY, FOUR-LANE STREETS (ABRIDGMENT)
One method of relieving excessive congestion on a two-way street that has a substantial number of midblock left turns is the construction of a two-way left-turn lane (TWLTL). Although the safety effectiveness of the TWLTL has been the subject of many studies, few studies have been made of its operational effectiveness. The objective of this study was to quantify the effects of a TWLTL on the efficiency of traffic flow on a two-way, four-lane street. By using computer simulation models specifically developed and validated for the purpose of this study, traffic operations were simulated over a range of traffic volumes and driveway densities. The reductions in stops and delays that result from a TWLTL were computed from the outputs of these simulation runs. Isograms of stops and delay reductions were prepared to facilitate the use of the results of this study to evaluate the potential cost-effectiveness of TWLTL installations. (Author)
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Supplemental Notes:
- Publication of this paper sponsored by Committee on Operational Effects of Geometrics. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Ballard, John L
- McCoy, Patrick T
- Publication Date: 1983
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 54-57
- Monograph Title: HIGHWAY GEOMETRICS, INTERACTIVE GRAPHICS, AND LASER MAPPING
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Serial:
- Transportation Research Record
- Issue Number: 923
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Cost effectiveness; Four lane highways; Left turns; Simulation; Traffic delays; Traffic flow; Traffic lanes; Two lane highways
- Uncontrolled Terms: Two way traffic
- Subject Areas: Design; Highways; Planning and Forecasting; I21: Planning of Transport Infrastructure;
Filing Info
- Accession Number: 00390065
- Record Type: Publication
- ISBN: 0309036127
- Report/Paper Numbers: HS-037 060
- Files: TRIS, TRB
- Created Date: Nov 30 1984 12:00AM