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Evaluating the Operational Features of an Unconventional Dual-Bay U-Turn Design for Intersections
Median U-turn intersection treatment (MUTIT) has been considered an alternative measure to reduce congestion and traffic conflict at intersection areas. The MUTIT is sometimes difficult to implement in the field because it requires wide median on arterials for U-turn vehicles. The objective of this...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4965191/ https://www.ncbi.nlm.nih.gov/pubmed/27467127 http://dx.doi.org/10.1371/journal.pone.0158914 |
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author | Xiang, Yun Li, Zhibin Wang, Wei Chen, Jingxu Wang, Hao Li, Ye |
author_facet | Xiang, Yun Li, Zhibin Wang, Wei Chen, Jingxu Wang, Hao Li, Ye |
author_sort | Xiang, Yun |
collection | PubMed |
description | Median U-turn intersection treatment (MUTIT) has been considered an alternative measure to reduce congestion and traffic conflict at intersection areas. The MUTIT is sometimes difficult to implement in the field because it requires wide median on arterials for U-turn vehicles. The objective of this study is to introduce an unconventional U-turn treatment (UUT) for intersections which requires less median space but is also effective. The UUT has a dual-bay design with different turning radiuses for small and large vehicles. The VISSIM simulation model was developed to evaluate the operational features of the UUT. The model was calibrated using data collected from intersections in China. The capacity, delay and number of stops were evaluated and compared with the direct-left-turn (DLT) for the same intersections. The results showed that the UUT significantly improved the operations at intersection areas, especially when volume/capacity ratio is small, and ratio of left-turn to through traffic is small. With the UUT, the capacity is increased by 9.81% to 10.38%, vehicle delay is decreased by 18.5% to 40.1%, and number of stops is decreased by 23.19% to 36.62%, when volume/capacity ratio is less than 0.50. The study also found that traffic efficiency could be further improved when the UUT is designed in conjunction with signal control. In the case, the UUT plus signalized control increases the capacity by 25% to 26.02%, decreases vehicle delay by 50.5% to 55.8%, and reduces number of stops by 69.5%, compared with the traditional DLT. |
format | Online Article Text |
id | pubmed-4965191 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-49651912016-08-18 Evaluating the Operational Features of an Unconventional Dual-Bay U-Turn Design for Intersections Xiang, Yun Li, Zhibin Wang, Wei Chen, Jingxu Wang, Hao Li, Ye PLoS One Research Article Median U-turn intersection treatment (MUTIT) has been considered an alternative measure to reduce congestion and traffic conflict at intersection areas. The MUTIT is sometimes difficult to implement in the field because it requires wide median on arterials for U-turn vehicles. The objective of this study is to introduce an unconventional U-turn treatment (UUT) for intersections which requires less median space but is also effective. The UUT has a dual-bay design with different turning radiuses for small and large vehicles. The VISSIM simulation model was developed to evaluate the operational features of the UUT. The model was calibrated using data collected from intersections in China. The capacity, delay and number of stops were evaluated and compared with the direct-left-turn (DLT) for the same intersections. The results showed that the UUT significantly improved the operations at intersection areas, especially when volume/capacity ratio is small, and ratio of left-turn to through traffic is small. With the UUT, the capacity is increased by 9.81% to 10.38%, vehicle delay is decreased by 18.5% to 40.1%, and number of stops is decreased by 23.19% to 36.62%, when volume/capacity ratio is less than 0.50. The study also found that traffic efficiency could be further improved when the UUT is designed in conjunction with signal control. In the case, the UUT plus signalized control increases the capacity by 25% to 26.02%, decreases vehicle delay by 50.5% to 55.8%, and reduces number of stops by 69.5%, compared with the traditional DLT. Public Library of Science 2016-07-28 /pmc/articles/PMC4965191/ /pubmed/27467127 http://dx.doi.org/10.1371/journal.pone.0158914 Text en © 2016 Xiang et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
spellingShingle | Research Article Xiang, Yun Li, Zhibin Wang, Wei Chen, Jingxu Wang, Hao Li, Ye Evaluating the Operational Features of an Unconventional Dual-Bay U-Turn Design for Intersections |
title | Evaluating the Operational Features of an Unconventional Dual-Bay U-Turn Design for Intersections |
title_full | Evaluating the Operational Features of an Unconventional Dual-Bay U-Turn Design for Intersections |
title_fullStr | Evaluating the Operational Features of an Unconventional Dual-Bay U-Turn Design for Intersections |
title_full_unstemmed | Evaluating the Operational Features of an Unconventional Dual-Bay U-Turn Design for Intersections |
title_short | Evaluating the Operational Features of an Unconventional Dual-Bay U-Turn Design for Intersections |
title_sort | evaluating the operational features of an unconventional dual-bay u-turn design for intersections |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4965191/ https://www.ncbi.nlm.nih.gov/pubmed/27467127 http://dx.doi.org/10.1371/journal.pone.0158914 |
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