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The detour roads will be Décarie Blvd., Upper Lachine Rd. and Girouard. Addington and Prud’Homme Ave. will only be open to local traffic for at least the first year. The road configuration may change after that, Giroux said.

The work will also require the closing of two access ramps for three months starting at the end of March: the Décarie Expressway entrance from Highway 20 eastbound, and the Highway 15 South access (toward the Champlain Bridge) off the Ville Marie Expressway. The Ville Marie Expressway exit toward St-Jacques will also be closed for a period of three or four months starting this fall, so part of it can be rebuilt.

Giroux said there are several mitigation measures planned to ease congestion in the sector. However many of them are already in place. Among them are a reserved lane on Sherbrooke St. W. for buses and taxis, a new turning lane on Côte-St-Luc Rd. heading east to access Décarie Expressway southbound, and a new exit off Décarie toward de Maisonneuve Blvd. The department plans to add a bus lane on Upper Lachine for the 90 and 104 buses.

He added that the work on the collector is going as fast as possible because crews are working around the clock. He did not know if the company that won the tender to rebuild the street will be able to work 24 hours. If it could, that would make the project’s end date considerably earlier.