Effect of Upstream Signals on Sign-Controlled Intersections and Roundabouts

Modified on: 2015-04-10 12:04:34 +1000

SIDRA INTERSECTION can be used to model the effect of major road upstream signals on the capacity of minor movements at intersections controlled by Stop and Give-way (Yield) signs, as well as roundabouts. For this purpose, the extra bunching parameter is used in association with the bunched exponential model of opposing stream headways. In network analysis, the program calculates the extra bunching values automatically. The method is described in the SIDRA INTERSECTION user guide.

As an extension of the HCM 2010 roundabout capacity model in SIDRA INTERSECTION, the effect of upstream signals is also modelled when the HCM 2010 model option is used although the HCM 2010 model does not use a bunched distribution of circulating stream headways.

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