King's 401, commonly referred to as 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 controlled-access 400-series 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 401 that passes through Toronto is North America's busiest ,[4][5] and one of the widest.[6][7] Together with Queb
King's 418, or simply 418, is a tolled freeway in the Canadian province of Ontario that opened on December 9, 2019. The 400-series travels through the Regional Municipality of Durham to connect 401 with the eastern extension of 407