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King's Highway 401 is a 400-series highway in the Canadian province of Ontario stretching 817.9 kilometers (508.2 mi). The portion that passes through Toronto is the busiest highway in the world, and one of the widest (18 lanes pictured near Toronto Pearson International Airport). By the end of 1952, three individual highways were numbered "Highway 401": the partially completed Toronto Bypass between Weston Road and Highway 11; Highway 2A between West Hill and Newcastle; and the Scenic Highway between Gananoque and Brockville. The route was expanded across the province, and became fully navigable from Windsor to the Quebec border on November 10, 1964. In 1965 it was designated the Macdonald–Cartier Freeway, in honour of the Fathers of Confederation, and it became a freeway for its entire length in 1968. A portion of the highway was designated the Highway of Heroes in 2007, as the road is travelled by funeral convoys for fallen Canadian Forces personnel from CFB Trenton to the coroner's office in Toronto. In 2011 construction began on a westward extension of Highway 401 that will be known as the Herb Gray Parkway and extend to Interstate 75 via a new international crossing. (Full article...)