MONTREAL Major roadwork is planned for the Sainte-Pierre Interchange and on Highway 20 as well as the Galipeault Bridge and in Longueuil. Motorists are advised to avoid these and other areas - including the Atwater Ave. exit on Highway 15 North - with scheduled work. SAINT-PIERRE INTERCHANGE From Friday at 11:59 p.m. to Monday at 5 a.m., the following closure is in effect: The Highway 20 East ramp to Route-138 West towards the Honore-Mercier Bridge. As a result, the following is a default closure: The 1st Ave. entrance for Route-138 West. HIGHWAY 20/GALIPEAULT BRIDGE From Friday at 8:30 p.m. to Saturday at 7 a.m., the following closure is in effect: