Flatness Based Control of Traffic Flow for Coordination of Ramp Metering and Variable Speed Limits

In this article the authors apply the concept of flatness control to coordinate variable speed and ramp metering in order to regulate the flow at the mainline section of the road. The same approach was applied in the case of traffic control to a single section with an on-ramp without combination with variable speed limits. The basic idea is that speed limits can increase the (density) range in which ramp metering is useful. The authors use the Lighthill-Whitham-Richards (LWR) traffic flow model with the functions of supply and demand between the segments to take into account the back propagation of the traffic jams. The purpose of the control task is to maximize the flow and minimize the queue length at the on-ramp. The authors illustrate the flatness approach by comparing the cases 'ramp metering only' and 'coordinated ramp metering and speed limits' for a simple network.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References;
  • Pagination: pp 838-843
  • Monograph Title: 11th International IEEE Conference on Intelligent Transportation Systems (ITSC 2008)

Subject/Index Terms

Filing Info

  • Accession Number: 01577553
  • Record Type: Publication
  • ISBN: 9781424421114
  • Files: TRIS
  • Created Date: Aug 14 2015 6:17PM