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| direction_b = South | end_b = Thomas Road | through = , | show_links = yes }} Tonkin Highway is a north-south highway in Perth, Western Australia, linking Perth Airport and Kewdale with the city's north-eastern and south-eastern suburbs. The northern terminus is at Reid Highway in Malaga, and the southern terminus is at Thomas Road in Oakford. It forms the entire length of State Route 4, and connects to several major roads, including Great Eastern Highway, Leach Highway, Roe Highway, and Albany Highway. Planning for the route began in the 1950s, but the first segment between Wattle Grove and Cloverdale was not opened until 1980. Over the next five years, the highway was extended north to Great Eastern Highway and south to Albany Highway, and a discontinuous section was constructed north of the Swan River. In 1988 the Redcliffe Bridge linked these sections, and three years later, Reid Highway became the northern terminus. The next major works on the highway, between 2003 and 2005, extended the highway south to Thomas Road. The Gateway WA project plans to improve the road network around Perth Airport, including upgrading the central section of Tonkin Highway to a six-lane freeway-standard road. Construction began in 2013, and completion is scheduled for 2017. Further extensions to both the northern and southern extents of the highway are planned, which would connect the highway to the proposed Perth Darwin National Highway near Ballajura, and to South Western Highway south of Byford. ==Route description== Tonkin Highway forms the entire length of State Route 4. It is maintained by Main Roads Western Australia, and subject to control of access along its entire length.〔 Some sections of the highway are freeway-standard, with grade-separated interchanges; however, most junctions on the highway are at-grade and traffic light controlled. The highway is a dual carriageway, primarily four lanes wide, though near some junctions the width briefly increases to six lanes.〔 The speed limit is near intersections, and along the stretches in between.〔(【引用サイトリンク】url=http://gis.mainroads.wa.gov.au/roadinformationmap/ )〕 A shared pedestrian and bicycle path is built alongside part of Tonkin Highway, between Collier Road and Great Eastern Highway, as well as south of Mills Road East. In most other sections, the highway's sealed shoulders also function as bicycle lanes. Main Roads Western Australia monitors traffic volume across the state's road network, including several locations along Tonkin Highway.〔 The section near Perth Airport, south of Great Eastern Highway, is the busiest, averaging over 56,000 vehicles per weekday in 2007–08, and over 57,000 in 2008–09. North of the Swan River, the traffic volume gradually decreased to under 40,000 vehicles per weekday near the northern terminus, in 2007–08. Measurements in 2008–09 showed the lowest volume to be under 10,000 vehicles per weekday near the southern terminus, north of Thomas Road. , intersections in and around Kewdale, Forrestfield and Perth Airport carry traffic volumes beyond their capacity during peak periods. Average peak period traffic speeds in this part of Tonkin Highway were measured as or less in 2013. The slowest section was from Leach Highway to Horrie Miller Drive, which recorded an average of during the afternoon peak period. Traffic volume, exceeding 50,000 vehicles per day in 2012, is forecast to almost double by 2031. Traffic modelling has shown that leaving the current network of traffic light controlled intersections in place would result in gridlock by 2021. An upgraded road network, after the Gateway WA project is completed, is expected to have an average speed in peak periods of between in 2021. 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「Tonkin Highway」の詳細全文を読む スポンサード リンク
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