An Innovative Signal Timing Strategy for Implementing Contraflow Left-Turn Lanes at Signalized Intersections with Split Phasing

Rongwei Guo, Jinli Liu and Yi Qi
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Rongwei Guo: School of Mathematics and Statistics, Shandong Academy of Sciences, Qilu University of Technology, Jinan 250353, China
Jinli Liu: Department of Transportation Studies, Texas Southern University, Houston, TX 77004-9986, USA
Yi Qi: Department of Transportation Studies, Texas Southern University, Houston, TX 77004-9986, USA

Sustainability, 2021, vol. 13, issue 11, 1-18

Abstract: Contraflow Left-Turn Lanes (CLLs) have the potential of being a solution for mitigating congestions at signalized intersections where split phasing is recommended or required. However, the current signal timing strategy for the intersections with CLLs cannot be directly applied at the signalized intersections with split phasing (SIWSP). To address this problem, this study proposed an innovative signal timing strategy, which is referred to as Counterclockwise Split Phasing (CSP) signal timing, for implementing the CLLs at the SIWSPs. A traffic simulation-based case study was conducted and the results indicate that, by using the proposed CSP signal timing plan, CLLs can be implemented at the SIWSP and can significantly reduce the traffic congestions caused by the high left-turn demand at this type of intersection. In addition, since the proposed CSP signal timing design procedure has fully considered the clearance time requirements for the left-turn vehicles on the CLLs, the risk associated with the use of CLLs can be controlled which makes it safe to use this innovative intersection design at SIWSPs.

Keywords: Contraflow Left-Turn Lanes (CLLs); intersection congestion; split phasing (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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