Abstract To improve the practical capacity of the tandem intersections and eliminate the conflicts between left-turn bicycles and left-turn vehicles at the main signal, four alternative designs are proposed from the aspects of time separation and spatial separation. In terms of time separation, left-turn bicycles and left-turn vehicles are separated by the two-step crossing for left-turn bicycles design and the exclusive phase for pedestrian and bicycles design. In terms of spatial separation, exclusive passing space for left-turn bicycles is provided by using partial left-turn design in the sorting area and moving the stop line backward. A linear programming model, which combining four optimization designs into one unified optimization framework, is established with the objective of maximizing the practical capacity of vehicles. A case study and extensive numerical analysis are used to validate the effectiveness and identify the application domain of these alternative designs. The results demonstrate the promising effect of the two-step crossing for left-turn bicycles design and the moving the stop line backward design in avoiding conflicts between left-turn bicycles and vehicles while improving the vehicular capacity. The two-step crossing for left-turn bicycles design can improve 10–20% vehicular capacity under almost all analysis conditions, but it increases the delay of left-turn bicycles. The benefit of the moving stop line backward design is sensitive to cycle length and the proportion of left-turn vehicles. It performs well when the cycle time exceeds 90 s, and the proportion of left-turn vehicles exceeds 30%.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Analysis of alternative treatments for left turn bicycles at tandem intersections


    Contributors:
    Zhao, Jing (author) / Yan, Jiachao (author) / Wang, Jiawen (author)


    Publication date :

    2019-06-29


    Size :

    15 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    An innovative design for left turn bicycles at continuous flow intersections

    Zhao, Jing / Gao, Xing / Knoop, Victor L. | Taylor & Francis Verlag | 2019



    Left-Turn and In-Lane Rumbel Strip Treatments for Rural Intersections

    K. Fitzpatrick / M. A. Brewer / A. H. Parham | NTIS | 2003


    Derivation of Decision Boundaries for Left-Turn Treatments at Signalized Intersections

    Raessler, Andrew / Yang, Jidong J. | Transportation Research Record | 2017


    Left-Turn and Rumble Strip Treatments for Rural Intersections: Poject Summary Report

    K. Fitzpatrick / M. A. Brewer / A. H. Parham | NTIS | 2004