Amadeous
I went to Montreal this summer and noticed that some part of St-Catherine were pedestrian. I don't know if it is temporary or definitive.
The concerned parts are between Rue de Bleury and Rue Saint-Urbain, between Rue Saint-Urbain and Boulevard Saint-Laurent and from Rue Saint-Hubert to some other street (I never went at the end to check, maybe someone could check this out ?). In the Village, some perpendicular streets to St-Catherine cross it, hence it is not completely pedestrian.
Is it clear ?