Main Roads Western Australia | 5 The upgrade of this heavily used roundabout sawMain Roads’ SouthWest Region apply sound engineering principles and practices to research, design and deliver the State’s first fully signalised roundabout. This innovative traffic engineering solution significantly reduced crashes and congestion soon after installation. Main Roads investigated many alternative layouts over several years to establish the best solution to address the roundabout's safety and capacity problems. This work has led to the adoption of an ultimate layout that includes a flyover for traffic entering the Bunbury CBD along the Australind Bypass, with a large roundabout underneath as the preferred option. This option was chosen giving consideration to traffic benefits, cost, use of the nearby Preston River bridges, impact on existing development, traffic disruption during construction and the potential for staged development. Traffic modelling of the signalised roundabout showed that this treatment would increase vehicle capacity by about 40 per cent, reduce the long peak hour queues and provide sufficient capacity for the next
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