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Saturation flow rate analysis for special width approach lanes: An empirical study in Karlsruhe, Germany
The special width approach lane (SWAL) is a newly proposed unconventional design, whereby a wide approach lane is divided into two narrower lanes. The design entails the use of a single lane by two passenger cars or one heavy vehicle. Such design has been applicated at signalized intersections of Ka...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9398025/ https://www.ncbi.nlm.nih.gov/pubmed/35998180 http://dx.doi.org/10.1371/journal.pone.0272503 |
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author | Xu, Jingqi Kigen, Kevin K. Xu, Dalin Wang, Shilin Gu, Min Liu, Xinyu Zhao, Jing |
author_facet | Xu, Jingqi Kigen, Kevin K. Xu, Dalin Wang, Shilin Gu, Min Liu, Xinyu Zhao, Jing |
author_sort | Xu, Jingqi |
collection | PubMed |
description | The special width approach lane (SWAL) is a newly proposed unconventional design, whereby a wide approach lane is divided into two narrower lanes. The design entails the use of a single lane by two passenger cars or one heavy vehicle. Such design has been applicated at signalized intersections of Karlsruhe, Germany. This paper focuses on the saturation flow rate analysis since most existing studies on such design rely on the default highway capacity manual (HCM) values. Saturation flow rate data was collected at four SWAL design based signalized intersections with procedural steps of the HCM 2010 using the video camera. The two-sample t-test was performed to explore the potential influencing factors, and then the non-linear regression analysis was conducted to estimate the saturation flow rate of SWAL. The proposed model can effectively depict the saturation flow rate with lane marking, presence of cyclists, and rainfall being the influencing factors. The overall accuracy of the proposed model is about 95%. The results indicate that the three influencing factors are independent of each other. The existence of cyclists and rainfall lead to a decrease in the saturation flow rate, while the lane markings can improve the saturation flow rate. Moreover, the SWAL works well in Karlsruhe, Germany. The model predicts a base saturation flow rate value of 1652 pcu/h/ln, which is plausible with comparison of the base saturation flow rate recommended in the German Highway Capacity Manual. |
format | Online Article Text |
id | pubmed-9398025 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Public Library of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-93980252022-08-24 Saturation flow rate analysis for special width approach lanes: An empirical study in Karlsruhe, Germany Xu, Jingqi Kigen, Kevin K. Xu, Dalin Wang, Shilin Gu, Min Liu, Xinyu Zhao, Jing PLoS One Research Article The special width approach lane (SWAL) is a newly proposed unconventional design, whereby a wide approach lane is divided into two narrower lanes. The design entails the use of a single lane by two passenger cars or one heavy vehicle. Such design has been applicated at signalized intersections of Karlsruhe, Germany. This paper focuses on the saturation flow rate analysis since most existing studies on such design rely on the default highway capacity manual (HCM) values. Saturation flow rate data was collected at four SWAL design based signalized intersections with procedural steps of the HCM 2010 using the video camera. The two-sample t-test was performed to explore the potential influencing factors, and then the non-linear regression analysis was conducted to estimate the saturation flow rate of SWAL. The proposed model can effectively depict the saturation flow rate with lane marking, presence of cyclists, and rainfall being the influencing factors. The overall accuracy of the proposed model is about 95%. The results indicate that the three influencing factors are independent of each other. The existence of cyclists and rainfall lead to a decrease in the saturation flow rate, while the lane markings can improve the saturation flow rate. Moreover, the SWAL works well in Karlsruhe, Germany. The model predicts a base saturation flow rate value of 1652 pcu/h/ln, which is plausible with comparison of the base saturation flow rate recommended in the German Highway Capacity Manual. Public Library of Science 2022-08-23 /pmc/articles/PMC9398025/ /pubmed/35998180 http://dx.doi.org/10.1371/journal.pone.0272503 Text en © 2022 Xu et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://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 Xu, Jingqi Kigen, Kevin K. Xu, Dalin Wang, Shilin Gu, Min Liu, Xinyu Zhao, Jing Saturation flow rate analysis for special width approach lanes: An empirical study in Karlsruhe, Germany |
title | Saturation flow rate analysis for special width approach lanes: An empirical study in Karlsruhe, Germany |
title_full | Saturation flow rate analysis for special width approach lanes: An empirical study in Karlsruhe, Germany |
title_fullStr | Saturation flow rate analysis for special width approach lanes: An empirical study in Karlsruhe, Germany |
title_full_unstemmed | Saturation flow rate analysis for special width approach lanes: An empirical study in Karlsruhe, Germany |
title_short | Saturation flow rate analysis for special width approach lanes: An empirical study in Karlsruhe, Germany |
title_sort | saturation flow rate analysis for special width approach lanes: an empirical study in karlsruhe, germany |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9398025/ https://www.ncbi.nlm.nih.gov/pubmed/35998180 http://dx.doi.org/10.1371/journal.pone.0272503 |
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