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The Ontario provincial highway network consists of all public highways maintained by the Canadian province of Ontario. The Ministry of Transportation of Ontario (MTO) maintains over of roadways organized into various classifications which crisscross the province and provide access to major population centres. Like most provinces, Ontario established a highway network in early 1920 as a result of the Canada Highways Act. Initially, the responsibility for these roads fell under the Department of Public Highways. In 1930, the department was renamed as the Department of Highways (DHO). Roadways in sparsely populated northern Ontario fell under the Department of Northern Development (DND) until it was merged into the DHO in 1937. That same year, the first divided highway and interchange in Canada – The Middle Road – was opened, inspired by German autobahns. Following World War II, construction of highways was accelerated; the first fully controlled-access highway was opened between Toronto and Barrie in 1952, the Highway 401 was navigable in 1964, and a network of secondary and collector highways was constructed through the rugged Canadian Shield throughout the 1950s. In 1960, ''The Gap'' opened along the north shore of Lake Superior and completed the Trans-Canada Highway in the province. The decade that followed saw the opening or planning of almost every freeway in Southern Ontario completed to date. In recent years, work has been focused on twinning existing routes into divided highways rather than establishing new corridors. == Highway classes == Ontario has several distinct classes of highways: King's Highways, (which includes Controlled-access highways) and secondary highways, with individual highways referred to as "that part of the King's Highway known as No. xx," or simply "the King's Highway known as No. xx." 〔(Public Transportation and Highway Improvement Act ); R.S.O. 1990, Chapter P.50〕 For the purposes of legal jurisdiction, however, the Highway Traffic Act deems that tertiary roads are also considered to be "King's Highways".〔Highway Traffic Act; R.S.O. 1990, Chapter H.8〕 The term "the King's Highway" was first adopted in place of "provincial highway" in 1930, and signs similar to the current design but with the words THE KING'S HIGHWAY above the route number replaced the previous smaller triangular signs. However, this name has been deprecated since the 1990s, and the old signs were replaced circa 1993. Currently these highways are again identified as "provincial highways"〔Municipal Act, 2001; SO 2001, c. 25〕 or "provincially maintained highways"〔(Provincially Maintained Highways )〕 by the Ontario Ministry of Transportation. The Highway Traffic Act, amended as recently as 2006, still refers to them as "King's Highway". Both terms are sometimes used within the same regulation as the older term is phased out.〔Conservation Authorities Act; R.R.O. 1990, Regulation 164, Amended to O. Reg. 172/06〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Highways in Ontario」の詳細全文を読む スポンサード リンク
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