Freight Facts and Figures 2013
Figure 3-11. Permitted Longer Combination Vehicles on the National Highway System: 2011
Longer combination vehicles (LCVs) include truck tractors pulling a long semi-trailer and a short trailer (often called a Rocky Mountain Double), a long semi-trailer and a long trailer (often called a Turnpike Double) or a short semi-trailer and two trailers (called a Triple). 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.
Empty triples are allowed on I-80 in Nebraska. NHS mileage as of 2011, prior to MAP-21 system expansion.
U.S. Department of Transportation, Federal Highway Administration, Office of Freight Management and Operations, 2013.
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