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The national highways network'' of India is a network of highways that is managed and maintained by agencies of the Government of India. These highways measured over as of 2015, including over of limited-access expressways (motorways). Out of 96,260 km of national highways 22,900 plus km are at least 4 laned with the remaining 50,000 km 2 laned.〔(【引用サイトリンク】title=Image: Phase I II III Eng.jpg, (3408 × 4465 px) )〕 Indian government has set itself a target of construct and upgrade 30 km of highway per day (11,000 km per year) from 2017 and all new construction will be using cement concrete instead of bitumen. In India, National Highways are at-grade roads whereas Express Highways, commonly known as Expressways, are controlled-access highways, mostly 6-lane or above, where entrance and exit is controlled by the use of slip roads (ramps) that are incorporated into the design of the highway. The highways do not have shoulder lanes. The speed on highway is mostly unregulated and is mostly slowed by heavy trucks in middle lanes. The highways are also used by pedestrians and cyclists creating dangerous situations. The National Highways Authority of India (NHAI) is the nodal agency responsible for building, upgrading and maintaining most of the national highways network. It operates under the Ministry of Road Transport and Highways. The National Highways Development Project (NHDP) is a major effort to expand and upgrade the network of highways. NHAI often uses a public-private partnership model for highway development, maintenance and toll-collection. While national highways constitute 1.7% of Indian roads, they carry 40% of the traffic.〔(【引用サイトリンク】title=Indian road network )〕 The majority of existing national highways are two-lane roads (one lane in each direction), though much of this is being expanded to four-lanes, and some to six or more lanes. Some sections of the network are toll roads. Over of new highways are planned or under construction as part of the NHDP, as of 2011. This includes over of expressways currently under construction. == Current system == India has of national highways (NH) connecting all the major cities and state capitals as of July 2013. National highways comprise 1.7% of India's total road network, but carry about 40% of road traffic. Most of them have two lanes. About have been widened to four lanes with two lanes in each direction as of August 2011. Only a few national highways are built with cement concrete. As of 2010, of national highways were still single-laned roads. The government is currently working to ensure that by December 2014 the entire national highway network consists of roads with two or more lanes. India has the distinction of having the world's second highest-altitude motor highway— Leh-Manali Highway, connecting Shimla to Leh in Ladakh, Kashmir. National highways form the economic backbone of the country and have often facilitated development along their routes, and many new towns have sprung up along major highways. Highways also have large numbers of small restaurants and inns (known as ''dhabas'') along their length. They serve popular local cuisine and serve as truck stops. Ministry of Road Transport and Highways, Government of India adopted a new systematic numbering of national highways in April 2010. The new system will indicate the direction of national highways whether it is east-west (odd numbers) or north-south (even numbers) and also the geographical region where they are located, increasing from east to west and from north to south. 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「National Highway (India)」の詳細全文を読む スポンサード リンク
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