Ontario Highway 427

Highway 427
Highway 427 (in red) within Ontario, Canada, with the Greater Toronto Area enlarged in the inset
Route information
Length:	19.9 km (12.4 mi)
Existed:	December 4, 1971 – present
Major junctions
South end:	Queen Elizabeth Way / Gardiner Expressway – Toronto (Continues as Browns Line)
	Highway 401  Highway 407
North end:	Regional Road 7 – Vaughan (Continues as Regional Road 99)
Highway system
Ontario provincial highways List 400-series Former ← Highway 420 QEW →

King's Highway 427 (pronounced "four twenty-seven"), also known as Highway 427 and colloquially as the 427, is a 400-series highway in the Canadian province of Ontario that connects the Queen Elizabeth Way (QEW) and Gardiner Expressway with York Regional Road 7 (formerly Highway 7) via Highway 401. An arterial extension, known as York Regional Road 99, continues 800 metres (2,600 ft) north to Zenway Boulevard. It is Ontario's second busiest freeway by volume and third busiest in North America, behind Highway 401 and Interstate 405 in California. Like Highway 401, a portion of the route is divided into a collector-express system with twelve to fourteen continuous lanes. Notable about Highway 427 are its several multi-level interchanges; the junctions with QEW and Highway 401 are two of the largest interchanges in Ontario and were constructed between 1967 and 1971, while the interchanges with Highway 409 and Highway 407 are more recent and were completed in 1992 and 1995, respectively.

Highway 427 is the main feeder to Toronto Pearson International Airport from the north and south. However, while much of the traffic comes from Highway 407, Highway 401 (eastbound), and the QEW / Gardiner Expressway makes use of the freeway for airport access, it serves the western portion of Toronto (Etobicoke), the northeastern portion of Mississauga (Malton), the southeastern portion of Brampton (Claireville), and the western portion of Vaughan (Woodbridge). The section between Highway 401 and Dundas Street is a heavily traversed transit corridor; GO Transit, MiWay, and the Toronto Transit Commission (TTC) all operate express buses along this section of the highway.