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The Thai highway network follows the left-hand traffic rule of the road. The network is the twin responsibility of the Department of Highways (DOH, (タイ語:กรมทางหลวง), ''Krom Thang Luang''), and the Department of Rural Roads (DORR, , ''Krom Thang Luang Chonnabot''), under the oversight of the Transportation ministry of Thailand. Public highways (, ''thang luang'') are also called public roads (, ''thanon luang''), especially when part of urban streets. The network spans over 70,000 kilometers across all regions of Thailand.〔Thailand Public Relations Department (Transport and Communication ). Retrieved October 14, 2008. 〕 Most are single carriageways. Dual carriageways have frequent u-turn lanes and intersections slowing down traffic. Coupled with the increase in the number of vehicles and the demand for a limited-access motorway, the Thai Government issued a Cabinet resolution in 1997 detailing the motorway construction master plan.〔(Paper "Privatization of Highway Infrastructure in Thailand" Bureau of Planning, Department of Highways, Thailand ). Retrieved 2008-10-19. 〕 Some upgraded sections of highway are being turned into a "motorway", while other motorways are not being built from highway sections. == Types of highways == The 1992 Highway Act ((タイ語:พระราชบัญญัติทางหลวง พ.ศ. 2535)), revised as the 2006 Highway Act ((タイ語:พระราชบัญญัติทางหลวง (ฉบับที่ 2) พ.ศ. 2549)), defines the following five highway types:〔(DOH website, ประเภททางหลวง ), retrieved on November 13, 2008 〕 A special highway ((タイ語:ทางหลวงพิเศษ)) or motorway is a high capacity highway designed for high speed traffic, for which the Department of Highways carries out construction, expansion, upkeep and repairs, and is registered as such. Motorway entrances and exits have controlled access, and controlled by the DOH. Registration of motorways is overseen by the Director General of the DOH. A national highway ((タイ語:ทางหลวงแผ่นดิน)) is a primary highway, part of the network connecting regions, provinces, districts, and other important destinations, for which the DOH carries out construction, expansion, upkeep and repairs. Registration of national highways is overseen by the Director General of the DOH. A rural highway ((タイ語:ทางหลวงชนบท)) or rural road is a highway for which the Department of Rural Roads carries out construction, expansion, upkeep and repairs. Registration of rural highways is overseen by the Director General of the DORR. A local highway ((タイ語:ทางหลวงท้องถิ่น)) or local route is a highway for which the local administrative organization carries out construction, expansion, upkeep and repairs. Registration of rural highways is overseen by the provincial governor. A concession highway ((タイ語:ทางหลวงสัมปทาน)) is a highway for which a legal government concession has been granted. Registration of concession highways is overseen by the Director General of the DOH. 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「Thai highway network」の詳細全文を読む スポンサード リンク
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