Project Proponent State Planning Commission Main Roads Department Shire of Mundaring Shire of Swan Proposal description A proposal for a major road system in the eastern corridor of the Perth metropolitan region has been put forward by the joint proponents, the State Planning Commission, Main Roads Department, Shire of Mundaring and Shire of Swan. The proposal is for an upgrading of the Great Eastern Highway, the development of a Hills Spine Road by extending Cameron road and a new route referred to as the Orange Route in combination with upgrading of Toodyay road. Region Perth Referred under EP Act s38 Industry sector Infrastructure Last updated March 01, 1989 4. EPA Report on assessment EPA Report Number 380 EPA Report EPA Report 380 (PDF, 2.98 MB) Date published Wednesday, March 1, 1989 - 12:00