The Travel Time Transmission Model for Dynamic Network Loading

This paper presents the travel time transmission model (TTM), a new dynamic network loading (DNL) procedure developed based on the Lagrangian-space formulation of the Lighthill-Whitham-Richards model. The Lagrangian-space coordinate system allows the TTM to preserve the efficient cell-based network representation of the cell transmission model (CTM) while gaining the numerical benefits and vehicle-based representation of Lagrangian traffic flow models. In contrast to the flow- and density-based traffic state estimation of the CTM, the proposed model estimates travel time and time headway (the inverse of flow). This facilitates model calibration using traffic flow data obtained from point detectors and probe vehicles. The numerical process in TTM updates link traffic states by evaluating the travel time changes caused by the propagation of vehicles. A modified node model is introduced in which intersection delay can be easily formulated. Furthermore, the analogy of the vehicle propagation process facilitates the formulation of queuing at the cell level. The proposed model is tested using a simple four-link network, in which the TTM is found to be able to reproduce the shock boundaries of the theoretical solution more efficiently than the CTM.

• Supplemental Notes:
  • This paper was sponsored by TRB committee ADB30(5) Paper Review Group #1.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Jin, Peter J
  • Boyles, Stephen D
• Conference:
  • Transportation Research Board 93rd Annual Meeting
  • Location: Washington DC
  • Date: 2014-1-12 to 2014-1-16
• Date: 2014

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 17p
• Monograph Title: TRB 93rd Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Headways; Lagrangian functions; Networks; Traffic flow; Traffic models; Travel time
• Uncontrolled Terms: Cell transmission models
• Subject Areas: Highways; Operations and Traffic Management; Planning and Forecasting; I71: Traffic Theory; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 01506475
• Record Type: Publication
• Report/Paper Numbers: 14-5718
• Files: TRIS, TRB, ATRI
• Created Date: Feb 3 2014 3:39PM