Highlights Linear program for integrating shared autonomous vehicles with transit. Traffic flow modeled through the link transmission model. Rolling horizon algorithm for application to larger networks. Integration with transit reduces total person travel time. Transit is especially useful with low headways or small autonomous vehicle fleets.

    Abstract Use of shared autonomous vehicles (SAVs) for last-mile transportation can improve transit use and reduce road congestion. We investigate the problem of optimal integration of SAVs with transit. By optimal, we mean that transit should be used instead of or to complement SAVs only when it reduces the total system travel time. Although greater use of transit reduces congestion, transit often increases travel time due to frequent stops and transfers. By using a continuous approximation to passenger and vehicle movements, we formulate the problem as a linear program using the link transmission model for traffic flow. One of the main challenges is associating passenger movement with vehicles that can have different destinations (e.g. a transit stop). Although the mathematical program is linear, it nevertheless has a large number of variables. We find a suboptimal solution using a rolling horizon method, which greatly reduces the required computation time. We also demonstrate an example of a possibly unfair passenger-to-vehicle ordering, and propose a first-come-first-served greedy algorithm to match passengers. A suite of experimental results on the Sioux Falls network show that using transit decreases total system travel time, especially when SAV fleet sizes are small. Transit also decreases the time travelers spend waiting, but tends to increase in-vehicle travel time. The methodology could be useful both for future SAV operators and for planners seeking to predict the effects of SAVs on traffic congestion.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    A linear program for optimal integration of shared autonomous vehicles with public transit


    Contributors:


    Publication date :

    2019-10-19


    Size :

    22 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Competition between shared autonomous vehicles and public transit: A case study in Singapore

    Mo, Baichuan / Cao, Zhejing / Zhang, Hongmou et al. | Elsevier | 2021



    A framework for railway transit network design with first-mile shared autonomous vehicles

    Shan, Ali / Hoang, Nam Hong / An, Kun et al. | Elsevier | 2021


    JRC2011-56060 Shared Use of Railway Corridors by Public Transit Vehicles

    Eyquem, A.J.M. / Hutchins, J.L. / Taylor, C. et al. | British Library Conference Proceedings | 2012


    Shared Autonomous Vehicles Ontology

    de Sousa Boieiro, Pedro / da Silva, Miguel Mira / Santoro, Flavia Maria et al. | Springer Verlag | 2022