Long Combination Vehicle
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Long combination vehicles are combinations of multiple Trailers on tractor trucks as compared to standard 5 axle semi trailer-trucks. Combinations of LCVs are: 
40 foot container turnpike double - 148,000 lbs GVW
Rocky Mountain 40' 20' - 134,000 lbs GVWR
20 foot container double - 120,000 lbs GVWR
20 ft container straight truck w/ 20ft container trailer - 120,000 lbs GVWR
- 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)
- B-Train - 33 foot 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.
Certain States allow certain combinations on certain routes within there States. In western America LCVs are allowed on many Interstates and highways and the only LCV allowed nationwide are STAA doubles.
State LCVs
MAP-21 transportation bill
Future combinations are under study and consideration to be allowed on the National Network. These new standards will be released in November 2014.
See also
- Federal Bridge Weight Formula
- Semi-trailer truck
- Dolly (trailer)
- Intermodal freight transport
References
http://www.epa.gov/smartway/forpartners/documents/trucks/techsheets-truck/EPA420F10-053.pdf
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