Abstract
Methods are given for estimating the capacities and operating characteristics of signalized intersections. A saturation flow, 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.