405. For the purposes of this division and unless the context indicates otherwise,(1) “load” means everything conveyed by a road vehicle or combination of road vehicles;
(2) “axle load” means the mass measured under the wheels of an axle or of the axles included in one category established by regulation of the Government, resulting from the distribution on such wheels of the mass of a road vehicle or combination of road vehicles, including accessories, equipment and load; this mass may be expressed as the aggregate of the units of mass measured under each wheel of an axle or of the axles included in one category;
(3) “total loaded mass” means the mass of a road vehicle or combination of road vehicles, including accessories, equipment and load; such mass may be expressed as the aggregate of the axle loads;
(4) “escort vehicle” means any motor vehicle used for escorting an outsized vehicle;
(5) “outsized vehicle” means(a) a road vehicle or a combination of road vehicles the axle load, the total loaded mass, or one dimension of which does not conform to the norms established by regulation of the Government; or
(b) a combination of road vehicles made up of more than three road vehicles, a detachable axle supporting a semi-trailer not being considered when computing the number of vehicles making up the combination.