An alignment for the Perth-Darwin National Highway from Reid Highway to Muchea and a future public transport corridor have been included by the State Planning Commission in a major amendment to the Metropolitan Region Scheme for the North East Metropolitan Corridor (Amendment No. 950/33). The amendment proposes to reserve land necessary to accommodate the future highway and an adjacent public transit corridor.

In view of the environmental issues associated with the highway proposal, the Environmental Protection Authority requested the proponents, Main Roads Western Australia and Ellenbrook Management Pty Ltd, undertake a Public Environmental Review to investigate the environmental effects of the proposal.