The St-Remi tunnel connecting Verdun and St-Henri has now been shut down as part of the large-scale reconstruction of the Turcot Interchange and surrounding access points.
St-Remi Street will be closed to vehicle traffic between St-Ambroise Street and De L'Eglise Avenue until November.
The work will also temporarily close down Cabot Street between Angers Street and Gilmore Avenue and permanently close Brock Street between Gladstone and Cabot streets.
According to Transport Quebec spokesperson Isabelle Monette, the goal is to create an "at-grade intersection" at the corner of St-Remi and Cabot with two traffic lights.
Anyone looking to get across the Lachine Canal will need to take the Atwater tunnel into Verdun or follow a detour via Monk.
The tunnel will remain accessible to pedestrians and cyclists.
The $3-billion Turcot Interchange restructuring project is expected to be completed in 2018.