Advanced Software for Roundabouts SIDRA INTERSECTION is the most advanced software for roundabouts and Version 9 includes many new powerful model features. Our innovation for Roundabout Metering Signals We developed a unique method for modelling Roundabout Metering Signals for traffic and transport professionals around the world to solve complex problems for better roundabout operation. Most widely used software tool in the USA SIDRA INTERSECTION is the most widely-used software tool in the USA for roundabout capacity and performance analysis. Highway Capacity Manual (HCM) for SIDRA...