Bangor Bypass Corridor Study, Sydney Australia
The Bangor Bypass is a road corridor in Sydney, Australia, which moves almost 50,000 vehicles per day between Menai and Sutherland over the Woronora River. The corridor carries private vehicles, public transport, cyclists and pedestrians to/from the Sutherland Town Centre. This area experiences congestion in the AM period with queues backing up over half a kilometre on a regular basis.
TDG was commissioned to carry out a corridor study, including defining and analysing safety, congestion and network gap deficiencies. An AIMSUN microsimulation model was created to carry out the deficiency analysis, scheme assessment, and economic evaluation.
Throughout the study, three opportunities were discovered. The most major, and probably cause of the study, was the congestion and room for improvement here. Alongside this gaps in the walking and cycling networks were identified and so were safety concerns around lighting, merging and growth potential at prioritised intersections.
By the end of the study, three schemes were developed to treat these deficiencies and provided to the client for prioritisation in the wider region. The picture across shows the options used to develop these schemes. In the end, two widening schemes to improve the congestion were developed and evaluated, one for general traffic and one specifically for public transport. Schemes to plug the gaps in the active transport networks were developed, and a safety review addressing the safety concerns was carried out.
By widening the Bypass for general traffic, 409 hours were forecasted to be saved in the AM period each day in 2026, leading to estimated annual savings of $5.6 million in the year and providing a benefit to cost ratio of around 15 over the lifetime of the project.
Cameron Bradley (July 16)