LCV
Longer combination vehicle (LCV) means any combination of a truck-tractor and two or more trailers or semi-trailers, which operate on the National System of Interstate and Defense Highways with a gross vehicle weight (GVW) greater than 36,288 kilograms (80,000 pounds).
Source
49 CFR § 380.105
Scoping language
The definitions in part 383 of this subchapter apply to this part, except where otherwise specifically noted.