Methods are given for estimating the capacities and operating characteristics of signalised intersections. Saturation flows, that is the rates at which vehicles can cross the stopline during the period that a green signal is showing, are calculated in terms of the number and types of lanes. Saturation flows are expressed in terms of through-car units (tcu's) per hour of green. Adjustments are given for kerb lane usage, lane width, gradient, parking and the effect of trams. The y value for any approach or movement is the ratio of the arrival flow to the saturation flow for that approach or movement. It is recommended that the sum of y values for an intersection should not exceed 0.7, where the sum of y values must contain one and only one y value for each phase in the cycle. Numerical examples are given to illustrate each type of calculation. A method of measuring saturation flows is described in the appendix. /Author/

  • Corporate Authors:


    Melbourne, Victoria  Australia 
  • Publication Date: 1978-4

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 26 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00179172
  • Record Type: Publication
  • Report/Paper Numbers: ARR No. 79
  • Files: TRIS, ATRI
  • Created Date: Sep 14 1978 12:00AM