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Highway 21 is a highway in the Canadian province of Saskatchewan. It runs from Montana Secondary Highway 233 at the United States border near Willow Creek to Highway 950/Highway 919 within the Meadow Lake Provincial Park. Highway 21 is about 722 km (449 mi.) long. Highway 21 passes through the major communities of Maple Creek, Kindersley, Kerrobert, and Unity. Highway 21 intersects three major western Saskatchewan highways: Highway 1, Highway 7, and Highway 16. Highway 21 has average annual daily traffic (AADT) of 500 vehicles a day and truck traffic is 30% of this total. Unity has two inland grain terminals. The oil and gas industry is also active in this area. ==History== In 1999 the granular pavement section of Highway 21 north of Kerrobert was tested with a cold in-place recycling or “CIR” method to rehabilitate highways. This CIR process is a cost-effective method which recycles the top surface of a road. This pulverized material is mixed with asphalt emulsion and spread and compacted back onto the highway surface. This surface is then recovered with a new seal dependent on traffic volume.〔 〕 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「Saskatchewan Highway 21」の詳細全文を読む スポンサード リンク
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