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Tibbitt to Contwoyto Winter Road is an annual ice road first built in 1982 to service mines and exploration activities in the Northwest Territories and Nunavut in Northern Canada. Between long, the road is said to be the world's longest heavy haul ice road and operates for eight to ten weeks starting in the last week of January.〔〔(Tibbitt to Contwoyto Winter Road, Northwest Territories and Nunavut, Canada ) - NUNA Logistics〕〔 Most of the road (85%–87%) is built over frozen lakes, , with the remaining built on over 64 land portages between lakes.〔〔〔(Facts )〕 This ice road was the location of the first season of Ice Road Truckers. ==Construction and operation== The winter road is constructed by Nuna Logistics and RTL-Robinson every January and takes about six weeks to complete.〔〔(Supplying Canada’s Northern Diamond Mines )〕〔 The first vehicle along each season is a Swedish-made Hägglund army-type reconnaissance vehicle designed to float if it falls through the ice; it tows an ice-thickness-detecting sonar.〔 This is followed by road building equipment including "specialized low ground pressure equipment".〔 The road, built extra wide to avoid blockages during blizzards and to allow opposing trucks to pass, is kept clear of snow, which acts as insulation, throughout the season as removal allows the ice to freeze faster and thicker.〔 The road is wide on the ice, but narrower on land portages ranging between wide. Once initially built, the road is checked by drilling holes into the ice. If the ice needs to be thickened, water trucks are called in to add water to that specific area. The road is only operational during February and March, an average of 67 days per year. The ice has been proven by engineers to support light vehicle loads at and increasing to full highway truck loads as the ice thickens.〔 A thickness of is required for a super B tanker carrying up to and may weigh up to .〔(Construction - Backed by Experience, Monitored with Science )〕 On some lakes, traffic may be re-routed to new lanes to avoid damaged or rough sections of ice, and additional "express lanes" allow returning, empty trucks to travel at higher speeds. The highest allowable speed for fully loaded trucks on the ice is with some areas reduced to only . Empty trucks have a maximum speed limit of on the ice. Speed limits are strictly enforced by security personnel with radar used to clock speeds just as national and provincial police forces do.〔〔(Security )〕 There are three road camps servicing drivers hauling loads along the road, they are at: Dome Lake Maintenance Camp, Lockhart Lake and Lac de Gras.〔 Dome Lake is for maintenance crew and emergency use for drivers, Lockhart Lake provides drivers with food, shower, and a place to do laundry. Lac de Gras is for road crews, emergency use and for driver facilities for drivers travelling north of Ekati. Truck drivers are not allowed to travel the winter road alone, therefore, up to four trucks are dispatched from Yellowknife every 20 minutes.〔(Safety )〕 Heavy and wide loads are dispatched from Yellowknife between 12:00 am and 6:00 am to avoid daily commuter traffic. The main product shipped is diesel fuel and other materiel includes "cement, tires, prill (ammonium nitrate) for explosives manufacture, and construction materials."〔 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「Tibbitt to Contwoyto Winter Road」の詳細全文を読む スポンサード リンク
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