The Kwinana Freeway extension bridges in Perth feature innovative abutments that combine reinforced earth with pre-cast facing panels, a world's first. This unique design allowed for shorter bridge spans, easy construction, and a high-quality finish. The concept was developed by Thiess Contractors and Breuchle Gilchrist and Evans, with The Reinforced Earth Company refining the design for cost savings and construction ease. The project's success was a result of collaboration between the three parties. The final design considered construction and bridge loading effects on the facing panels and reinforced soil abutment. The project showcases the advantages and limitations of this construction method.