SIGNALISED INTERSECTIONS CAPACITY GUIDE

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:

  ARRB

  Melbourne, Victoria  Australia 
• Publication Date: 1978-4

Media Info

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

Subject/Index Terms

• TRT Terms: Estimates; Mathematical models; Percent saturation; Signalized intersections; Traffic control; Traffic flow; Traffic lanes
• Subject Areas: Highways; Operations and Traffic Management;

Filing Info

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