Worongary to Mudgeeraba Six Laning
HDR was commissioned by DMD Construction Pty Ltd to assist with the upgrade of one of the busiest sections of the Pacific Motorway on the Gold Coast, widening the north and southbound lanes from four to six between the Worongary and Mudgeeraba interchanges. The project scope also included extending and upgrading the Exit 77 and Exit 79 on and off-ramps; widening existing bridges, and widening the southbound motorway between the Mudgeeraba and Robina interchanges.

HDR’s role involved redesigning the pavements and associated traffic management plans to produce significant cost savings to the contractor. HDR’s alternative pavement design delivered the client a cost saving of $3 million, and also minimised disruption time to the motorway.

Mudgeeraba to Robina Additional Lane Southbound
This project was an extension of the original Worongary to Mudgeeraba project and involved the widening of the existing southbound carriageway from two to three lanes. This additional lane connects to the Pacific Motorway Worongary to Mudgeeraba section and the Robina Interchange. HDR undertook the detailed design on behalf of CMC for a length of approximately 3 km, including the Mudgeeraba Creek Bridge and Mudgeeraba Creek Overflow Bridge Widenings.

Complex construction staging constraints dictated that the existing precast kerbs on the Mudgeeraba Creek Bridge needed to be cut to sit flush with the new widening. This process was considered quite innovative as the insitu cutting of prestressed girders had never been carried out in Queensland. A test cut under strict guidelines was carried out off-site prior to the successful operation site adopting the learnings and safety in design principles from the test.

Key features of HDR’s work were developing traffic management plans for effective construction in a highly constrained and highly congested motorway corridor, widening of existing bridges under live traffic, and cost-effective pavement designs.