Optimizing Mass Transit Utilization in Emergency Evacuation of Congested Urban Areas

This paper presents how the capacity of mass transit can be optimally operated to alleviate congestion pressure during the evacuation of busy urban areas. The proposed model extends the traditional vehicle routing problem (VRP) to include: Multiple Depots to better distribute the transit fleet, Time Constraints to account for the evacuation time window, and constraints for Pick-up and Delivery locations of evacuees. The evacuation problem is hereafter defined as a Multi-Depot Time Constrained Pick-up Delivery Vehicle Route Problem (MDTCPD-VRP). A framework, using Constraint Programming (CP), is developed to model and solve the MDTCPD-VRP evacuation problem. An Optimal Spatoi-Temporal Evacuation (OSTE) model is performed first to optimize the evacuation of the background vehicular traffic, generating transit travel cost (i.e. link travel times) as an input to the MDTCPD-VRP. We apply our methodology on a case study of a hypothetical evacuation event in the busiest core of the downtown area of the City of Toronto, Ontario, with 65% of total evacuees are transit-dependent. The results show the optimal scheduling and routing plan for transit-vehicles as the solution to the evacuation problem defined as MDTCPD-VRP. The equilibrium mode-split between traffic and transit (at which the total vehicle-travel time is equal for vehicular drivers and transit users) is found to be at 25% and 75%, respectively.

Language

  • English

Media Info

  • Media Type: DVD
  • Features: Figures; Photos; References; Tables;
  • Pagination: 19p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01151209
  • Record Type: Publication
  • Report/Paper Numbers: 10-3718
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 11:53AM