Ministry of Transportation / Ministère des Transports
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XI. Driving at night and in bad weather
Snow plows

Snow-removal vehicles on public roadways are equipped with flashing blue lights that can be seen from 150 metres.

Flashing blue lights warn you of wide and slow-moving vehicles: some snow plows have a wing that extends as far as three metres to the right of the vehicle. On freeways, several snow plows may be staggered across the road, clearing all lanes at the same time by passing a ridge of snow from plow to plow. Do not try to pass between them. This is extremely dangerous because there is not enough room to pass safely, and the ridge of wet snow can throw your vehicle out of control.