['Longer Combination Vehicles']
['Longer Combination Vehicles']
07/02/2025
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Combination: Truck tractor and 2 trailing units—LCV
LENGTH OF THE CARGO–CARRYING UNITS: 81 feet
MAXIMUM ALLOWABLE GROSS WEIGHT: 117,000 pounds
OPERATIONAL CONDITIONS:
WEIGHT: No single axle shall carry a load in excess of 20,000 pounds. No tandem axle shall carry a load in excess of 36,000 pounds. No triple axle, consisting of three consecutive load–bearing axles that articulate from an attachment to the vehicle including a connecting mechanism to equalize the load between axles having a spacing between the first and third axle of at least 96 inches and not more than 108 inches, shall carry a load in excess of 42,500 pounds. No vehicles operated on the Interstate System shall exceed the maximum weight allowed by application of Federal Bridge Weight Formula B.
No wheel shall carry a load in excess of 10,000 pounds. No tire on a steering axle shall carry a load in excess of 750 pounds per inch of tire width and no other tire on a vehicle shall carry a load in excess of 600 pounds per inch of tire width. “Tire width” means the width stamped on the tire by the manufacturer.
Dummy axles may not be considered in the determination of allowable weights.
DRIVER: The driver must have a commercial driver’s license with the appropriate endorsement.
VEHICLE: The lead semitrailer can be up to 48 feet long with the trailing unit up to 40 feet long. In a truck tractor–semitrailer–trailer combination, the heavier towed vehicle shall be directly behind the truck–tractor and the lighter towed vehicle shall be last if the weight difference between consecutive towed vehicles exceeds 5,000 pounds.
PERMITS: No permits required.
ACCESS: Unlimited access off the NN to terminals.
ROUTES: All NN routes.
LEGAL CITATIONS:
WS 31–5–1001, –1002, –1004, –1008, and WS 31–17–1–1 through 31–17–117.
Combination: Truck–trailer
LENGTH OF THE CARGO–CARRYING UNITS: 78 feet
OPERATIONAL CONDITIONS:
WEIGHT: This combination must operate in compliance with State laws and regulations. Because it is not an LCV, it is not subject to the ISTEA freeze as it applies to maximum weight.
DRIVER, PERMIT, and ACCESS: Same as the WY–TT2 combination.
VEHICLE: No single vehicle shall exceed 60 feet in length within an overall limit of 85 feet.
ROUTES: Same as the WY–TT2 combination.
LEGAL CITATIONS:
WS 31–5–1002
Combination: Automobile/Boat Transporter
LENGTH OF CARGO CARRYING UNITS: 85 feet
OPERATIONAL CONDITIONS:
WEIGHT: This combination must operate in compliance with State laws and regulations. Because it is not an LCV, it is not subject to the ISTEA freeze as it applies to maximum weight.
DRIVER, PERMIT, and ACCESS: Same as the WY–TT2 combination.
VEHICLE: The cargo–carrying length of automobile transporters that carry vehicles on the power unit is the same as the overall length. No single vehicle shall exceed 60 feet in length within an overall limit of 85 feet.
ROUTES: Same as the WY–TT2 combination.
LEGAL CITATIONS: Same as the WY–TT2 combination.
Combination: Saddlemount Combination
LENGTH OF CARGO CARRYING UNITS: 85 feet
WEIGHT: This combination must operate in compliance with State laws and regulations. Because it is not an LCV, it is not subject to the ISTEA freeze as it applies to maximum weight.
DRIVER, PERMIT, and ACCESS: Same as the WY–TT2 combination.
VEHICLE: The cargo–carrying length of saddlemount combinations that carry vehicles on the power unit is the same as the overall length. No single vehicle shall exceed 60 feet in length within an overall limit of 85 feet.
No more than three saddlemounts may be used in any combination, except additional vehicles may be transported when safely loaded upon the frame of a vehicle in a properly assembled saddlemount combination.
To wed vehicles in a triple saddlemount combination shall have brakes acting on all wheels which are in contact with the roadway.
All applicable State and Federal rules on coupling devices shall be observed and complied with.
ROUTES: Same as the WY–TT2 combination.
LEGAL CITATIONS: Same as the WY–TT2 combination.
['Longer Combination Vehicles']
['Longer Combination Vehicles']
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