The project involves the reconstruction of 42 bridges, of which 34 are steel girder bridges, and also includes a new cable-stayed bridge over the Lachine Canal, the reconstruction and relocation of Highways A15, A20, and A720, totaling 145 km of highway lanes, the relocation of 16 km of CN railway track and 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.
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.