Ontario Highway 401

Highway 401
Macdonald–Cartier Freeway
Highway 401 within Ontario, Canada
Route information
Maintained by the Ministry of Transportation of Ontario
Length	828.0 km[1] (514.5 mi)
History	Proposed 1938 Opened December 1947 – October 11, 1968[2] Extended June 28 and November 21, 2015
Major junctions
West end	Ojibway Parkway in Windsor
Major intersections	E. C. Row Expressway in Windsor  Highway 402 in London  Highway 403 near Woodstock  Highway 407 near Milton   Highway 403 / Highway 410 in Mississauga  Highway 427 in Toronto  Highway 409 in Toronto  Highway 400 in Toronto Don Valley Parkway / Highway 404 in Toronto Highway 412 in Whitby Highway 418 in Clarington  Highway 137 to I-81  Highway 416 towards Ottawa
East end	A-20 towards Montreal, QC
Location
Country	Canada
Province	Ontario
Major cities	Windsor, London, Kitchener, Mississauga, Toronto, Oshawa, Kingston and Cornwall
Highway system
Ontario provincial highways Current Former 400-series
← Highway 400 Highway 402 →

Ontario Highway 401, also called King's Highway 401, is a provincial highway in southern Ontario, Canada. It is 828.0 kilometres (514.5 miles) long. It starts near Ontario's border with Quebec, where the road is called Quebec Autoroute 20. The western end of the highway is in Windsor.

Construction on the highway started in 1947. By 1952, three different parts of the highway were finished, with the three parts connected by 1964. In 2013, another part of the highway was started. This part would extend the highway to the Gordie Howe International Bridge at the Canadian-U.S. border near Detroit.

In 2008, part of the highway between Trenton and Toronto was called the "Highway of Heroes". This was because many Canadian soldiers who were killed overseas arrived at the Trenton airforce base. Their bodies were then transported along the highway to Toronto.

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