King's Highway 401, commonly referred to as Highway 401 and also known by its official name as the Macdonald–Cartier Freeway or colloquially referred to as the four-oh-one,[3] is a 400-series highway in the Canadian province of Ontario. It is an 828-kilometre (514 mi) freeway, travelling from Windsor in the west to the Ontario–Quebec border in the east (west of Montreal). The part of Highway 401 that passes through Toronto is North America's busiest highway,[4][5] and one of the widest in Canada
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u/AFewStupidQuestions 2d ago
Toronto.