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West End motorists: brace yourselves for four years of traffic hell.

A main access route to the airport, the West Island and the Mercier Bridge will be closed starting Saturday at 11 p.m. and replaced by a temporary road that will have just one lane in each direction until 2019.

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The entrance and exit off Highway 20 and the entrance to Route 138 leading to the Mercier Bridge, at the base of Ste-Anne-de-Bellevue Blvd., will be closed permanently. For the next four years, traffic will be diverted to a temporary Angrignon Blvd. overpass over Highway 20. Once the work on the Montreal West Interchangeis completed, motorists in the area heading to and from Highway 20 and Route 138 will have to drive along the new Angrignon Blvd. overpass.

Motorists in Montreal West, Notre-Dame-de-Grâce, Lachine and LaSalle are the most affected by the closures. It’s added pain for Lachine residents since an entrance to Highway 20 East at St-Pierre Ave. was closed last month as part of the project.