ON DAVIDSON'S FLOW RATE-TRAVEL TIME RELATIONSHIP

Davidson's flow rate-travel time relationship has often been cited as a simple and convenient model for traffic flows on urban roads. However, only limited quantitative application of the model has been reported. One possible explanation for this observation could be the apparent difficulty in obtaining values for the model parameters. This paper gives a method for the simultaneous analytical determination of least squares estimates of the parameters. The method yields a surprisingly simple result. An application of Davidson's relationship to a short section of arterial road with centre tram lines, and containing a tram stop, is described. This application yields results which support a common assumption that the traffic capacity of an arterial road with trams is significantly less than an equivalent arterial road without trams. Under 'clearway' conditions, a maximum possible one-way flow rate of about 2600 veh/h is suggested for the arterial road shared by trams and motor vehicles. The test section studied was a single carriageway road, pavement width 13.4 M, and had centre tram lines. /Author/TRRL/

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 3-13
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00165686
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS, ATRI
  • Created Date: Apr 26 1981 12:00AM