The Highway 401 Project (the Project) involves the widening and reconstruction of approximately 18 km of Highway 401 in the western Greater Toronto Area (GTA), from east of the Credit River in Mississauga to west of Regional Road 25 in Milton. The Project includes widening the existing six-lane configuration to the following:

    • 12 lane core-collector system from the Credit River to Winston Churchill Boulevard;
    • 10 lanes from Winston Churchill Boulevard to Highway 407 ETR/Highway 401 interchange;
    • 12 lane core-collector system from Highway 407 ETR/Highway 401 interchange to east of the James Snow Parkway;
    • 10 lanes from the James Snow Parkway to west of Regional Road 25;
    • Median High Occupancy Vehicle (HOV) lanes; and
    • Support facilities and features including drainage, lighting, signage, Advanced Traffic Management System, carpool lots.

The expansion will also involve modifications to existing infrastructure to accommodate the proposed widening, including nine new, replaced or widened bridges, five bridge rehabilitations, retaining wall rehabilitation and seven culvert replacements, extensions or rehabilitations. West Corridor Constructors (WCC) has been selected by the Ministry of Transportation Ontario (MTO) and Infrastructure Ontario (IO) to design, build and finance the Project under a Public Private Partnership (P3) approach.

This Project is being completed through a Design-Build, Finance project delivery model. Under this model, detail design and construction can occur simultaneously as components of the Project advance and environmental clearances are issued. For a description of the EA Process for the Detail Design and Construction of the Highway 401 Expansion Project, see the Environmental Assessment page.

The preliminary design for the Project was previously completed in 2013 and the current detail design and construction is following the approved planning process for a Group ‘B’ project under the MTO Class EA for Provincial Transportation Facilities (2000). More information on the Class EA process and previous studies can be found on the Environmental Assessment page.

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