In July 2006, the Ministry of Public Infrastructure and Renewal released the Growth Plan for the Greater Golden Horseshoe. The Growth Plan is a direct result of extensive public and stakeholder input on the Proposed Growth Plan for the Greater Golden Horseshoe (November 2005), Draft Growth Plan for the Greater Golden Horseshoe (February 2005) and the Places to Grow discussion paper (July 2004). The Growth Plan outlines a strategy for managing growth and development in the Greater Golden Horseshoe over the next 30 years.

As part of the policies in the Growth Plan, the GTA North Transportation Corridor across and north of the Oak Ridges Moraine is not identified as an initiative. As such, the former GTA North Transportation Corridor Study is no longer active.

MTO has initiated a new study to support the vision identified in the Growth Plan. This new study is entitled the 427 Transportation Corridor Environmental Assessment Study.