That pole is very close to the corner: I'm guessing the bent signs are a mere 30 cm or so from the street. Furthermore, the sign that isn't bent is the highest of the three. If I were a betting man, my money would be on a truck having hit it. However, the only direction traffic comes from at that location is eastbound on Saint-Joseph, which is to say the damage appears to have been done in a direction that no traffic goes. Maybe a pharmaceutical truck was backing up to park in the 30-minute zone and make a delivery?