Zonal Route Design for Transit Corridors

Abstract

In “zonal express service,” a transit corridor is divided into zones. Each inbound zonal express route picks up passengers in its zone only, then runs express to the CBD; outbound routes do the opposite. In “zonal local service,” on the other hand, an inbound vehicle will stop between its service zone and the CBD to allow passengers to alight, but not to board. Outbound vehicles do the opposite; they will pick up passengers anywhere along the route, but will allow them to alight in the route’s service zone only. Zonal express service design, i.e., the choice of zone boundaries and of service frequencies, has been studied by Turnquist for linear corridors using dynamic programming. These results are extended to zonal design for bidirectional local service, including light direction dead-heading, and to branching as well as linear corridors. Application to a Boston area corridor shows considerable potential for reducing operator cost.

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