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Article

Statistical Analysis of Safety Performance of Displaced Left-Turn Intersections: Case Studies in San Marcos, Texas

by 1, 2, 2, 2 and 2,*
1
School of Mathematics and Statistics, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
2
Department of Transportation Studies, Texas Southern University, Houston, TX 77004, USA
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2020, 17(18), 6446; https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17186446
Received: 5 August 2020 / Revised: 1 September 2020 / Accepted: 2 September 2020 / Published: 4 September 2020
(This article belongs to the Section Industrial Ecology)
Displaced left-turn (DLT) intersections are designed to increase the mobility of vehicles by relocating the left-turn lane (lanes) to the far-left side of the road upstream of the main signalized intersection. Since DLT is a relatively new design and very limited crash data are available, previous studies have focused mainly on the analysis of its operational performance rather than its safety performance. To fill this gap, in this study, we investigated the safety performance of two DLT intersections located in San Marcos, Texas. Crash data from 2011 to April 2018 were extracted from the TxDOT Crash Record Information System (CRIS). These crash data were analyzed using two different approaches, i.e., statistical analysis and collision diagram-based analysis. The results of this study indicated that DLT did not increase the overall crash frequencies at the studied intersections. Traffic crashes related to left turns and right turns were reduced significantly by DLT. Meanwhile, it also caused safety issues related to traffic signage, traffic signal, geometric design, and access management at DLT intersections. Thus, in the implementation of DLT intersections, traffic engineers need to carefully consider different aspects of the DLT intersection design, including access management, traffic signal coordination, and driver acceptance. As a result of these analyses, recommendations were provided for the safe implementation of the DLT design in the future. View Full-Text
Keywords: displaced left-turn design; safety performance; before-and-after study; collision diagram displaced left-turn design; safety performance; before-and-after study; collision diagram
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MDPI and ACS Style

Qu, W.; Sun, Q.; Zhao, Q.; Tao, T.; Qi, Y. Statistical Analysis of Safety Performance of Displaced Left-Turn Intersections: Case Studies in San Marcos, Texas. Int. J. Environ. Res. Public Health 2020, 17, 6446. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17186446

AMA Style

Qu W, Sun Q, Zhao Q, Tao T, Qi Y. Statistical Analysis of Safety Performance of Displaced Left-Turn Intersections: Case Studies in San Marcos, Texas. International Journal of Environmental Research and Public Health. 2020; 17(18):6446. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17186446

Chicago/Turabian Style

Qu, Wenrui, Qiao Sun, Qun Zhao, Tao Tao, and Yi Qi. 2020. "Statistical Analysis of Safety Performance of Displaced Left-Turn Intersections: Case Studies in San Marcos, Texas" International Journal of Environmental Research and Public Health 17, no. 18: 6446. https://0-doi-org.brum.beds.ac.uk/10.3390/ijerph17186446

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