The Turcot Interchange in Montreal carries 300,000 vehicles a day, including 30,000 trucks, and is the most important interchange in the province of Quebec. The interchange consists of four major interchanges: Turcot, Angrignon, La Vérendrye and Montreal-Ouest, which stretches 7 km from west to east over Highways A15, A20 and A720. The interchange is an essential link between these highways and the Champlain Bridge, between the airport and downtown Montreal and is located above a goods and passenger railway network essential for the City of Montreal.

The project scope included:

• Reconstruction of 42 bridges, including 34 steel girder bridges and a new cable-stayed bridge over the Lachine Canal
• Reconstruction and relocation of Highways A15, A20, and A720, totaling 145 km of highway lanes
• Relocation of 16 km of CN railway track
• Construction of 65,000 m2 of retaining walls, built mostly under existing elevated structures, but also in close proximity to underground infrastructure including major historical utilities, residences, businesses, industries and protected environmental areas in a dense urban environment

The interchange had to remain fully operational throughout re-construction, with new construction happening in parallel with demolition of existing infrastructure, requiring significant maintenance of traffic operations.