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All Highways
*For a tractor or straight truck equipped with a device providing an alternative power source to keep the vehicle warm even though it is turned off, the axle weight and gross weight may exceed the maximum weight for that vehicle by up to 225 kg.
Width:3.2 m(if >2.6 m in width, lights/flags required; see http://tinyurl.com/NTsizeandweight)
Height:4.2 m
Length:
Straight trucks12.5 m
Truck-trailer combination21.0 m
Tractor-semitrailer combinations25.0 m
Tractor-twin-trailer combinations (A-, B-, C-trains)26.0 m
Semitrailer16.2 m
A-, B-, C-train trailer box length20.0 m
Weight:*
Steering axle5,500 kg(tractor)
7,300 kg(truck)
Single axle9,100 kg(other than the steering axle)
Super single axle6,000 kg
Tandem axle9,100 kg(axle spread less than 1.2 m)
17,000 kg(axle spread greater than 1.2 m)
Tandem axle with super single tires12,000 kg(axle spread greater than 1.2 m)
Tridem axle18,000 kg(axle spread 2.4 m or more but less than 3.0 m)
24,000 kg(axle spread 3.0 m or more but less than 3.7 m; 24,000 kg allowed for tridem drives on enhanced visibility highways, otherwise 21,000 kg)
Tridem axle with super single tires18,000 kg
Straight trucks16,400 kg(two axle)
24,300 kg(three axle)
31,300 kg(four axle)
Tractor-semitrailer combinations39,500 kg(5-axle)
46,500 kg(6-axle)
Truck trailer combinations53,500 kg
A-trains 53,500 kg(7 or more axles)
B-trains 56,500 kg(7-axles)
63,500 kg(8 or more axles)
C-trains58,500 kg(8-axle)
Load per cm width of tire100 kg/cm
Interaxle spacing weight limitsSee Schedule N of the Large Vehicle Control Regulations at http://tinyurl.com/NTsizeandweight. If interaxle spacing weights cannot be met, a permit is required.

Side mirrors, reflectors, lights, and cargo securement devices extending beyond the widest part of a vehicle are not counted in the total width of the vehicle.

Aerodynamic devices at the rear of a truck, full trailer, or semitrailer are not to be considered in the length of a vehicle if the aerodynamic device does not carry cargo and meets both of the following conditions:

  • Any portion of the device that is more than 1.9 metres above the ground does not protrude more than 0.61 metres beyond the rear of the vehicle; and
  • Any portion of the device that is within 1.9 metres of the ground does not protrude more than 0.305 metres beyond the rear of the vehicle.

A vehicle cannot be operated at a weight that will exceed the vehicle’s maximum gross vehicle weight rating as established by the manufacturer.

Complete vehicle weights and dimensions by vehicle type can be found in Schedules A through K of the Northwest Territories’ Large Vehicle Control Regulations. Visiting http://tinyurl.com/NTsizeandweight for the regulation.

Frost laws

For information on the Northwest Territories travel restrictions and seasonal advisories, go to www.dot.gov.nt.ca/Highways/Allowances.

View agency contacts

['Size and Weight Limits']
['Weights and dimensions']
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