Ontario Highway 401

Controlled-access highway in Ontario

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, is a controlled-access 400-series highway in the Canadian province of Ontario. It stretches 828 kilometres (514 mi) from Windsor in the west to the Ontario–Quebec border in the east. The part of Highway 401 that passes through Toronto is North America's busiest highway, and one of the widest. Together with Quebec Autoroute 20, it forms the road transportation backbone of the Quebec City–Windsor Corridor, along which over half of Canada's population resides. It is also a Core Route in the National Highway System of Canada. The route is maintained by the Ministry of Transportation of Ontario (MTO) and patrolled by the Ontario Provincial Police. The speed limit is 100 km/h (62 mph) throughout the majority of its length, with the remaining exceptions being the posted 80 km/h (50 mph) limit westbound in Windsor, in most construction zones, and the 110 km/h (68 mph) speed limit on the 40 km (25 mi) stretch between Windsor and Tilbury that was raised on April 22, 2022, the 7 km (4.3 mi) extension east of the aforementioned, the 35 km (22 mi) stretch between Highway 35 / 115 and Cobourg, the 44 km (27 mi) stretch between Colborne and Belleville, the 66 km (41 mi) stretch between Belleville and Kingston, and the 107 km (66 mi) stretch between Highway 16 and the east end of the highway that were raised on July 12, 2024.

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