Construction involved building the new southbound viaduct first, then demolition of the old southbound viaduct, followed by the construction of the new northbound section in the resulting gap, before the old northbound section was finally demolished. This ensured that except for short interruptions, normal motorway capacity would remain available throughout the construction period. Further work also took place around the viaduct, including the construction of a volcanic-themed walkway from Gillies Avenue to Broadway (via Clovernook Road) and an upgraded footbridge over State Highway 1 at Mt Hobson Road.