Planning Skip-Stop Transit Service under Heterogeneous Demands Yu Mei a, Weihua Gu a, Michael Cassidy b, Wenbo Fan c* a Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China B Department of Civil and Environmental Engineering, University of California, Berkeley, USA c School of Transportation and Logistics, Southwest Jiaotong University, Chengdu, China ABSTRACT Transit vehicles operating under skip-stop service visit only a suBset of the stops residing along a corridor. It is a strategy commonly used to increase vehicle speeds and reduce patron travel times. The present paper develops a continuous approximation model to optimally design a select form of skip- stop service, termed AB-type service. The model accounts for spatially-heterogeneous demand patterns. An efficient heuristic is developed to oBtain solutions. These are shown to Be near-optimal for a variety of numerical examples. Results also indicate that optimal AB-type designs outperform optimized all-stop service in a variety of cases. The AB-type service is found to Be especially competitive when travel demands are high, trip origins are unevenly distributed along a corridor, and patrons have relatively high values of time. In these cases, AB-type service is found to reduce system costs by as much as 8%. Keywords: transit corridor design; skip-stop service; continuous approximation; heterogeneous demand * Corresponding author. E-mail address:
[email protected]. 1 1 Introduction Skip-stop service can be used when multiple transit lines operate simultaneously in a single corridor. With this service, the Buses or trains assigned to each line visit only a subset of the corridor’s stops (Vuchic, 2005; Leiva et al., 2010; Chen et al., 2015B; Larrain and Muñoz, 2016; Soto et al., 2017).