CESS Seminar : Flexible Bus Service Design under Spatial and Temporal Demand Uncertainty


Event details

Date 18.04.2024
Hour 11:0012:00
Speaker Prof. Hong K. LO, GREAT Smart Cities Institute of the Hong Kong University of Science and Technology
Location Online
Category Conferences - Seminars
Event Language English
Zonal-based flexible bus service (ZBFBS) is a class of demand responsive door-to-door transit service, wherein the service area is divided into zones and services are arranged via zonal routes with detours within each zone to pick up and drop off passengers. Service requests are aggregated by zonal OD pairs, time windows, and the number of passengers per request. This presentation will address the design of ZBFBS with the stochastic programming approach to account for passenger demands’ spatial (origin-destination or OD) and volume stochastic variations over time. Two types of two-stage stochastic problems with recourse are formulated, one for the frequency-based approach to maximize the expected profit minus detour cost, and one for the schedule-based approach to include the time dimension. Finally, a bi-level framework is proposed to jointly optimize the zonal design and flexible bus service strategy. The zonal design and ZBFBS strategy are validated in instances constructed based on real data in Chengdu, China.

Short bio
Professor Hong K. LO is Dean of Engineering, Chair Professor of Civil and Environmental Engineering, and Director of GREAT Smart Cities Institute of the Hong Kong University of Science and Technology. His expertise includes dynamic transportation system modeling, traffic control, network reliability, and public transportation analysis. He has published extensively in the transportation literature and was selected as one of the Most Cited Researchers in Civil Engineering in the Academic Ranking of World Universities (ARWU). Professor Lo is very active in the transportation community, for instance, elected as Convener of the International Scientific Committee of the conference series Advanced Systems for Public Transportation (CASPT), serves as Founding Editor-in-Chief of Transportmetrica B: Transport Dynamics, Managing Editor of Journal of Intelligent Transportation Systems, and on the editorial boards of many international journals. Professor Lo was awarded the prestigious triennial World Conference on Transportation Research (WCTR) Prize and Eastern Asia Society for Transportation Studies (EASTS) Outstanding Paper Award, and HKUST School of Engineering Research Excellence Award.

Sandwiches are offered at the end of the seminar.

Practical information

  • Informed public
  • Free


  • Prof. Olga Fink (IMOS), Prof. Alexandre Alahi (VITA), Prof. Dusan Licina (HOBEL), Prof. Alain Nussbaumer (RESSLab)


  • Nikolaos Geroliminis