SIDRA—An Australian Program for Signalised Intersection Analysisby Rahmi Akcelik, Australian Road Research Board, Nunawading, Aust,
Abstract: As more complicated signal phasing systems have been implemented in practice, the analysis methods have moved from a phase-control philosophy applied to approach roads to a group-control philosophy applied to individual movements. Such complexities as overlap phasing and two green periods per cycle can be handled by the new methods of ARR No. 123 and SIDRA-2. With the development of SIDRA-2 methods for saturation flow/capacity estimation beyond ARR No. 123, complicated real-life problems involving opposed turns, short lanes, lane under-utilisation and lane interaction (shared lane) can now be solved by analytical modelling techniques without need for time-consuming simulation methods. The important feature of the capacity and performance estimation methods of SIDRA-2 is that they are based on lane-by-lane calculations. This allows for improved accuracy in the results and better insight into the operation of a signalised intersection.
Subject Headings: Traffic signals | Intersections | Traffic analysis | Model analysis | Simulation models | Streets | Transportation studies
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