La. Admin. Code tit. 73 § I-501
Axle Group- a combination of two or more consecutive axles considered together in determining their combined load effect on a highway (as tandem, tridum, or quadrum axle groups).
Axle with Single-Mounted Tires- any single or individual axle which is composed of one tire on each side of the vehicle (as opposed to dual-mounting).
Department- Louisiana Department of Transportation and Development (DOTD).
Designated Truck Routes- highways designated by the secretary of the department in accordance with the Surface Transportation Assistance Act of 1982 that includes provisions for truck-semi trailer-trailer combinations and maximum vehicle width of 8 feet 6 inches.
Domicile- the fixed, permanent, and principal residence for legal purposes.
Dromedary Unit- a load carrying compartment on a truck-tractor located between the cab and fifth wheel.
Dummy Axle- a single axle attached independently to the frame of a vehicle and so designed and placed as to indicate the appearance of and to carry a uniformly distributed load of a normal axle group.
Envelope Vehicle- a truck tractor/semitrailer combination or truck tractor manufactured housing combination that does not exceed the size and weight limits specified by the multi-state permit agreement.
Gross Weight- the weight of a vehicle and/or combination of vehicles plus the weight of any load thereon.
Individual Axle- any of the two, three, or four axles which make up the tandem, tridum, or quadrum axle groups.
Interstate Hauling- vehicle movement between or through two or more jurisdictions.
Intrastate Hauling- movement of a vehicle from one point within a jurisdiction to another point within the same jurisdiction, regardless of routes traversed.
Length- the total longitudinal dimension of a single vehicle, a trailer, or a semi-trailer. Length of a trailer or semi-trailer is measured from the front of the cargo-carrying unit to its rear and includes load-holding devices thereon.
Mobile Home-
1. a trailer or semi-trailer which is designed, constructed, and equipped as a dwelling place, living abode, or sleeping place, either permanently or temporarily, and is equipped for use as a conveyance on highways; or
2. a trailer or semi-trailer whose chassis and exterior shell is designed and constructed for use as a mobile home, as defined in Paragraph 1, but which is used instead permanently or temporarily for the advertising, sales, display, or promotion of merchandise or services, or for any other commercial purpose except the transportation of property for hire or the transportation of property for distribution by a private carrier.
Multi-State Permit Agreement- an agreement entered into with other states who have established an envelope vehicle that can be permitted for travel by the use of one common permit form through all member states that are a part of this consortium.
Quadrum Axle- any four consecutive axles whose centers are 40 or more inches but not more than 96 inches apart. A quadrum axle must be designed to equalize the load between the axles.
Semi-Trailer- any single vehicle without motive power designed for carrying property and passengers and so designed in conjunction and used with a motor vehicle that some part of its own weight and that of its own load rests or is carried by another vehicle and having one or more load-carrying axles.
Single Axle- any single axle or any assembly of two or more axles whose centers are less than 40 inches apart.
Stinger-Steered Combination- a truck-tractor semi-trailer wherein the fifth wheel is located on a drop frame located behind and below the rearmost axles of the power unit.
Tandem Axle- any two consecutive axles whose centers are 40 or more inches but not more than 96 inches apart. A tandem axle must be designed to equalize the load between the axles.
Trailer- any single vehicle without motive power designed for carrying property or passengers wholly on its own structure, drawn by a motor vehicle which carries no part of the weight and load of the trailer on its own wheels and having two or more load carrying axles.
Tridum Axle- any three consecutive axles whose centers are 40 or more inches but not more than 96 inches apart. A tridum axle must be designed to equalize the load between axles.
Variable Load Suspension Axles- axles which can be regulated by the driver of the vehicle either through the use of an in-cab valve or switch or by turning a valve on the outside of the truck. These axles are controlled by hydraulic and air suspension systems, mechanically, or by a combination of these methods.
Vehicle- any device by which a person or things may be transported upon a public highway or bridge. A trailer or semi-trailer shall be a separate vehicle.
Width- the total outside transverse dimension of a vehicle including any load or load holding devices thereon, but, excluding approved safety devices and tire bulge due to load.
La. Admin. Code tit. 73, § I-501