of the bridge. The Redcliffe Bridge, also built using the incremental launching technique, was designed to carry six traffic lanes, as well as pedestrian and cycle paths that could be converted into traffic lanes when required. The bridge deck is supported by a narrow central section with cantilever extensions on each side, as a "big heavy bridge would have looked out of place" at a relatively narrow section of the river. The bridge was designed by Maunsell and Partners Pty Ltd and constructed by Thiess. It was opened on 16 April 1988, and received awards for engineering excellence from both the national and state branches of the Institute of Engineers, Australia. The highway was then extended northwards, reaching Benara Road on 18 December 1989, and Reid Highway on 11 November 1991. Tonkin Highway spent a decade remaining largely unchanged, linking Reid Highway in Malaga with Albany Highway in Gosnells. In 2003, construction of a new southern extension commenced. Planning and Infrastructure Minister Alannah MacTiernan and the Member for Roleystone, Martin Whitely, participated in a sod turning ceremony on 27 June 2003, to mark the start of the project. At the time, the $140 million extension was the largest single road project in Western Australia. The project was completed in two stages, with Armadale Road as the midpoint. The first section, including a new interchange at Albany Highway, was opened by Premier Geoff Gallop and Alannah MacTiernan on 2 April 2005. The original connection to Albany Highway was renamed Ferres Drive. The Forrestdale Business Park and the Champion Lakes precinct were constructed concurrently with the project, to encourage industrial and residential development alongside the new highway section. The remaining , from Armadale Road through to Thomas Road, opened a year ahead of schedule on 16 December 2005. The new extension improved links with Kwinana, Armadale, Rockingham and Byford. It also provided a new freight route, diverting heavy vehicle traffic away from the existing road network and residential areas. Gateway WA Between 2014 and 2016, the $1 billion Gateway WA Perth Airport and Freight Access Project was undertaken to upgrade the road network around Perth Airport. At the time it was the largest project Main Roads Western Australia had ever undertaken, covering the upgrade of Tonkin and Leach highways, and the construction of four new interchanges. The project was jointly funded by state and federal governments, which provided $317.5 million and $686.4