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GENERAL INFORMATION
Definitions
AXLE:
A beam with a spindle or spindles about which wheels rotate.
AXLE GROUP:
A combination of two or more consecutive axles considered together in determining their combined load effect on a highway (such 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).
BOOSTER:
A mechanism which attaches additional axles to the rear of a trailer. The trailer to booster connection may rely on mechanical, air (or other gas), or hydraulic means to provide load transfer. Generally designed to provide axle spacing between groups of a minimum of ten (10) feet bridge or greater. (Also called axle extensions or stingers.)
CONVERTER DOLLY:
An auxiliary undercarriage assembly consisting of a chassis, fifth wheel and towbar used to convert a semitrailer to a full trailer. (No load distribution occurs between dolly & power unit.)
DECK:
The load carrying area on a platform, lowbed or chassis-type trailer. Can be flat level, dropside, recessed well (transformer) or beam design.
DEPARTMENT:
Louisiana Department of Transportation and Development (DOTD)
DOLLY, JEEP:
A short frame-type trailer complete with upper coupler, fifth wheel and undercarriage assembly and designed in such a manner that when coupled to a semi-trailer and tractor it carries a portion of the trailer kingpin load while transferring the remainder to the tractor fifth wheel. (Also called joe dog or a load divider dolly; usually has a sliding fifth wheel or a fixed fifth wheel for the trailer to couple with.)
DESIGNATED TRUCK ROUTES: (National Network – NN)
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 eight feet six 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/semi-trailer 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.
JEEP:
A short frame-type trailer complete with upper coupler, fifth wheel and undercarriage assembly and designed in such a manner that when coupled to a semi-trailer and tractor it carries a portion of the trailer kingpin load while transferring the remainder to the tractor fifth wheel. (Also called joe dog or a load divider dolly; usually has a sliding fifth wheel or a fixed fifth wheel for the trailer to couple with.)
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:
(a) 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 (b) a trailer or semi-trailer whose chassis and exterior shell is designed and constructed for use as a mobile home, as defined in (a), 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 that 96 inches apart. A quadrum axle must be designed to equalize the load between the axles.
SINGLE AXLE:
Any single axle or any assembly of two or more axles whose centers are less than 40 inches apart.
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.
STINGER-STEERED COMBINATION:
A truck tractor semi-trailer wherein the fifth wheel is located on a drop frame located behind and below the rear-most axles of the power unit.
TANDEM AXLES:
Any two consecutive axles whose centers are 40 or move inches but not more that 96 inches apart. A tandem axle must be designed to equalize the load between the 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 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.
TRAILER DOLLY:
An auxiliary undercarriage assembly consisting of a chassis, fifth wheel and towbar used to convert a semi-trailer to a full trailer.
TRAILER, DROP CENTER (Double Drop):
A trailer design employing an offset or drop in the cargo deck immediately behind the supports and another immediately in front of the suspension, the purpose of which is to lower the cargo deck and/or to provide the greatest height possible for the cargo in the dropped area.
TRAILER, DROP FRAME:
A trailer design employing one offset or drop in the cargo deck immediately behind the supports. (Also called a single drop trailer.)
TRUNION AXLE:
An axle configuration with two individual axles mounted in the same transverse plane, with four tires on each axle, connected at a pivot point which allows each individual axle to oscillate in a vertical plane to provide constant and equal weight distribution on each individual axle.
TRUNION AXLE GROUP:
Two or more consecutive trunion axles, which are individually attached to, and/or articulated, from the vehicle by a weight equalizing suspension system.
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.
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