In cell-transmission models of highway traffic one partitions a highway into small sections (cells) and keeps track of the cell contents (number of vehicles) as time passes. The record is updated at closely spaced instants (clock ticks) by calculating the number of vehicles that cross the boundary separating each pair of adjoining cells during the corresponding clock interval. This paper shows that the accuracy of the cell-transmission approach is enhanced if the downstream density that is used to calculate the receiving flow(s) is read L clock intervals earlier than the current time, where L is a non-negative integer that should be chosen by means of a simple formula. The rationale for the introduction of this lag is explained in the paper. The lagged cell-transmission model is related (but not equivalent) to both Godunov's first order method for general flow-density relations and Newell's exact method for concave flow-density relations. It is easier to apply and more general than the latter, and more accurate than the former.


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 81-104

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Filing Info

  • Accession Number: 00794621
  • Record Type: Publication
  • ISBN: 0080434487
  • Files: TRIS, ATRI
  • Created Date: Jun 1 2000 12:00AM