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Long combination vehicles〔https://www.testquestionsandanswers.com/cdl/combination-vehicles-test.html〕 are combinations of multiple Trailers on tractor trucks as compared to standard 5 axle semi trailer-trucks with one trailer. Combinations of LCVs are: *Turnpike double - two 40 ft trailers or longer up to 53 footers *Rocky Mountain doubles - one 40 ft trailer or longer and another shorter trailer usually a 28 foot (pup) *Triple trailer - three 28.5 ft pups *B-Train - 33 foot max twin trailer that shares a tridem wheel set between the front and back trailer. *STAA double Pup - two 28.5 ft trailers LCVs are useful because they usually carry extra freight in terms of square and cubic feet capacity as well as weight capacity because of the extra axels it spreads out the weight across a longer area. They're also more efficient based on Ton-mileage. In the US certain states allow certain combinations on certain routes within their states. In the western US LCVs are allowed on many Interstates and highways and the only LCV allowed nationwide are STAA doubles. ==MAP-21 transportation bill== Future combinations are under study and consideration to be allowed on the National Network. These new standards were scheduled to be released in November 2014. 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「Long Combination Vehicle」の詳細全文を読む スポンサード リンク
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