A straightforward method for shuttle-bus line design under urban rail transit emergencies

Abstract

Introducing shuttle-bus service has been proved to be an effective strategy for passenger evacuation under urban rail transit (URT) emergencies. Previous studies generally assumed that passengers in all origin-desitination (OD) pairs can be provided with bus service even though they may not be affected by emergencies, which restricts the utilization efficiency of limited evacuation resources. In this paper, we study the shuttle-bus line design problem under URT emergencies with the consideration of evacuation priorities. OD pairs are classified into three categories according to changes in the shortest and feasible paths, including uninfluenced, partial influenced, and total influenced. An evacuation mechanism that URT operates under sublines in cooperation with replacement and complementary shuttle-bus services is proposed. In addition, a straightforward method was developed to optimal shuttle-bus lines, consisting of two sequential steps: find a set of candidate shuttle-bus lines based on the shortest path problem theory and simplify the line set by combining and eliminating candidate lines. Numerical analysis is conducted to demonstrate the effectiveness of the proposed method.

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