Built on strong research foundations

Aerial photograph of road

Unique methodology built on strong research foundations

SIDRA was first developed implementing Dr Rahmi Akçelik’s well-known Research Report ARR 123 (Traffic Signals: Capacity and Timing Analysis). This was published by the Australian Road Research Board in 1981 and had a strong influence on signal analysis methods in the 1985 Highway Capacity Manual - an influence that continues today. The ARR 123 critical movement analysis method is built to handle simple to very complex phase sequences used for traditional as well as innovative (compound) intersections and interchanges. The timing analysis methodology was further developed introducing unique methods such as the green split priority and common control group methods in SIDRA INTERSECTION.