Freight Facts and Figures 2010
Figure 3-4. Permitted Longer Combination Vehicles on the National Highway System: 2009
Longer combination vehicles (LCVs) are tractors pulling 1) a semitrailer longer than 28 feet and a trailer longer than 28 feet, 2) a semitrailer longer than 28 feet and a trailer no more than 28 feet, or 3) a 28-foot semitrailer and two 28-foot trailers. Although all states allow conventional combinations consisting of a 28-foot semitrailer and a 28-foot trailer, only 14 states and 6 state turnpike authorities allow LCVs on at least some parts of their road networks. Allowable routes for LCVs have been frozen since 1991.
U.S. Department of Transportation, Federal Highway Administration, Office of Freight Management and Operations, special compilation by the Freight Operations and Technology Team, 2010.
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