Double (or dual) left-turn lanes (DLTLs) are a relatively new geometric feature, and the literature on their design parameters is limited. The effectiveness of the DLTL in improving the operation of an intersection depends on several design parameters; among them, the most critical is the length of the DLTL. A procedure for determining the length of the DLTL was developed. First, the procedure surveys how drivers choose a lane of the DLTL in the real world and analyzes the relationship between lane use and the volume of left-turn vehicles. Second, the procedure formulates the probability that all arriving left-turn vehicles during the red phase can enter the left-turn lanes; this means no overflow of left-turn vehicles from the DLTL and no blockage of the entrance of the DLTL by the queue of through vehicles. This probability is presented as a function of the length of the DLTL and the arrival rates of left-turn and through vehicles. The adequate lane length is derived such that the probability of the vehicles entering the DLTL is greater than a threshold value. Third, the adequate length is expressed in number of vehicles; later, this value is converted to the actual distance required on the basis of the vehicle mix and preference between the two lanes. Recommended lengths are presented as a function of left-turn and through volumes for practical application. The proposed approach is unique in that it avoids lane overflow and blockage of lane entrance.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Lengths of Double or Dual Left-Turn Lanes


    Additional title:

    Transportation Research Record


    Contributors:


    Publication date :

    2004-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Lengths of Double or Dual Left-Turn Lanes

    Kikuchi, Shinya | Online Contents | 2004


    Lengths of Double or Dual Left-Turn Lanes

    Kikuchi, S. / Kii, M. / Chakroborty, P. et al. | British Library Conference Proceedings | 2004


    Estimation of Design Lengths of Left-Turn Lanes

    Qi, Yi Grace | Online Contents | 2012


    Estimation of Design Lengths of Left-Turn Lanes

    Qi, Y.G. / Guo, L. / Yu, L. et al. | British Library Online Contents | 2012


    Lengths of Left-Turn Lanes at Signalized Intersections

    Kikuchi, Shinya | Online Contents | 1993