Ipswich Motorway Upgrade Case study Wacol to Darra Strength. Performance. Passion.With impressive aesthetic and environmental benefits, and an efficient construction method, the Department of Transport and Main Roads chose to incorporate a Humes precast Classic arch into the Wacol to Darra section of the Ipswich Motorway Upgrade. The 15m arch spans Bullockhead Creek, a tributary of the Brisbane River and an important wildlife corridor in the

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