Road Pricing Modeling for Hyper-Congestion

Many studies on road pricing have adopted the static modeling paradigm, typically using either separable monotone or backward-bending link travel time functions for the analysis. This study uses shockwave analysis to demonstrate that separable backward-bending link travel time functions are not appropriate for modeling hyper-congestion and hence road pricing. In the absence of queue spillback, link travel time is a monotone increasing function of inflow. However, in the presence of queue spillback, the authors show that the static paradigm even with a monotone travel time function cannot adequately portray the congestion phenomenon. In some cases, the tolls determined by the static paradigm can be even detrimental, worsening rather than alleviating the congestion problem. In the end, a modeling paradigm that faithfully captures both the temporal as well as the spatial dimensions of traffic queuing appears to be most appropriate for properly modeling congested networks.


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  • Accession Number: 01003119
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Aug 23 2005 11:26AM