Design method and verification for displacement-based two-phase intersection: A case study of T-intersection

ObjectiveThis study aims to overcome the limitations of traditional intersection optimization. It proposes a novel displacement-based two-phase intersection design to improve traffic efficiency at T-intersection.MethodFirst, the concept of displacement-based two-phase intersection was introduced. Its physical structures were classified into three types (i.e., single-point displacement, two-point displacement, and three-point displacement), totaling seven basic forms. Subsequently, two methods were designed for signal timing, i.e., simultaneous straight-through and asynchronous straight-through. Strategies for organizing motorized and non-motorized traffic were analyzed. Finally, a certain T-intersection in Wuhan City was selected as a case study to validate the design. Field data were collected. Models of existing status and proposed design were built by using VISSIM software. The key metrics were extracted, e.g., intersection overall level of service, average vehicle delay, and maximum queue length.ResultThe simulation result showed significant improvements. The overall level of service was greatly improved. The average vehicle delay dropped from 83.61 s to 22.23 s. The maximum queue length was reduced from 510 m to 100 m. These figures confirmed the strong potential of the displaced design for increasing traffic efficiency.ConclusionThe displacement-based two-phase intersection effectively alleviates congestion caused by traditional control methods, and improves intersection performance. The findings offer an innovative and practical design approach for managing urban traffic congestion, with high value for real-world application and promotion.