South Road upgrade/Gallipoli Underpass

The South Road Upgrade/Gallipoli Underpass project is a significant upgrade to one of Adelaide's major intersections, South Road/ANZAC Highway, involving grade separation to create free flowing north-south traffic movement on South Road. The underpass project is part of a broader plan to create a non-stop corridor for South Road, which extends from the southern suburbs to the Port River Expressway to the north. Minimising disruption to traffic and pedestrians at this busy intersection was a key consideration for design and construction. The underpass bridge carrying ANZAC Highway over South Road comprises a skew deck constructed in two halves to allow traffic and pedestrian movements through the intersection at all times during construction. The deck is fully integral with the abutments, which eliminates the need for support bearings and deck expansion joints at beam ends; this is a departure from previous practice in South Australia. The vertical walls of the underpass are supported by soil nail construction faced with reinforced shotcrete and clad with glass reinforced cement panels. Construction is due for completion in late 2009 ahead of schedule.