An important element of capacity estimation at signalised intersections is the estimation of opposed (permissive) turn saturation flows. Although the basic modelling philosophies of the Highway Capacity Manual and Australian methods are similar, there are significant differences in the procedures used and therefore, in the results from the two methods. In particular, the method used in the SIDRA INTERSECTION software has eliminated the use of opposed turn adjustment factors for lane groups and adopted an explicit and direct method of modelling individual lanes. The paper discusses these new methods.
AKÇELIK, R. (1988). Opposed Turns at Signalised Intersections: The Australian Method. ITE Journal 59(6), pp 21-27.