Review of United States research and guidelines on left turn lane offset: Unsignalized intersections and signalized intersections with permitted left turns
The purposes of this paper are to better understand the design and impact of left turn lane offset and provide state transportation agencies recommendations on best practices and alternative design options to address left turn sight line obstruction issues. Research studies and existing guidelines on left turn lane offset were reviewed and summarized to offer insights in driver sight distance and behavior, intersection safety and operations, as well as design elements related to left turn lane offset. Studies showed that at both unsignalized intersections and signalized intersections with permitted left turns, obstructed sight line could cause higher possibilities of collisions between left turning vehicles and oncoming vehicles from the opposing direction. Existing evaluations of left turn lane offset, with data from multiple states in the United States, reported that positive left turn lane offsets were beneficial in terms of safety and operations. Most agency guidelines provided very limited discussions about left turn lane offset. This review demonstrated that positive left turn lane offsets are beneficial to intersection safety and operations. Based on the review of research and guidelines, recommendations were provided for transportation agencies for left turn lane offset implementation. A discussion on new left turn design concepts was also included to point out directions for future research and practice.
- Record URL:
- Record URL:
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/20957564
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Supplemental Notes:
- Abstract reprinted with permission of Elsevier.
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Authors:
- Song, Yu
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0000-0003-2309-716X
- Chitturi, Madhav
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0000-0003-0580-3454
- Bremer, William F
- Bill, Andrea R
- Noyce, David
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0000-0001-5887-8391
- Publication Date: 2022-8
Language
- English
Media Info
- Media Type: Web
- Features: Figures; References; Tables;
- Pagination: pp 556-570
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Serial:
- Journal of Traffic and Transportation Engineering (English Edition)
- Volume: 9
- Issue Number: 4
- Publisher: Elsevier
- ISSN: 2095-7564
- Serial URL: http://www.journals.elsevier.com/journal-of-traffic-and-transportation-engineering-english-edition
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Publication flags:
Open Access (libre)
Subject/Index Terms
- TRT Terms: Guidelines; Highway safety; Left turn lanes; Offset intersections; Research; Reviews
- Geographic Terms: United States
- Subject Areas: Highways; Operations and Traffic Management; Research; Safety and Human Factors;
Filing Info
- Accession Number: 01840317
- Record Type: Publication
- Files: TRIS
- Created Date: Mar 25 2022 12:36PM