Heavy combination vehicle definitions and specifications

Combination vehicle


A towed vehicle in conjunction with one or more trailers or other motor vehicle being towed.

Total volume limit

The total mass of an A-shaped train must not exceed 39 tons. The total aggregate mass of a train B shall not exceed 39 tons, unless it has:

  • at least two axes driving the motor in a set of parallel shafts or triplets
  • three motor-driven axes in a tri-axle set.

The total combined mass of any other combination of a rigid vehicle and two trailers shall not exceed 20 tons.

Oscillating shaft

A pair of short axles in the same straight line on the vehicle, each of which is:

  • mounted with two wheels on it (with each wheel at least 500 mm apart on the vehicle), and
  • can oscillate, that is, one wheel can rise while the other falls.

total length

For a rigid vehicle and a full trailer assembly (including the load, but excluding the collapsible mirrors), the maximum overall length is 20 meters. The maximum overall length for a truck and semi-trailer combination (including the load, but not including the collapsible mirrors) is 19 meters *.Read more: Top 5 uses of Rotten Meat in Minecraft * A semicircle with four and two drive axles is limited to 18 meters (and must be first registered by December 1, 2017).

Rear axle – heavy trailer

Full heavy trailers, simple heavy duty trailers and heavy column trailers shall not have a rear axle. Heavy semi-trailers that are not part of train A or train B may have:

  • a parallel shaft set or a set of three axles with or without a drive shaft, or
  • a set of four axles with a rear rudder capable of turning in either direction with an angle of at least fifteen degrees, or two rudders if first registered before February 1, 2017. If two of the shafts are steering shafts, they must be:
    • the last two axes must be able to rotate in the same direction by an angle of at least 15 degrees, or
    • The front and rear axles must be able to rotate in opposite directions by at least 15 degrees.
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The quad axle unit must be certified by a heavy vehicle certification engineer, or other vehicle inspection or testing organization specifically approved by the Waka Kotahi Transport Authority NZ, to confirm that the drive axles meet the requirements. above.

The following sign unit spacing

Distance between the vehicle’s mounting point on the first trailer and the rear of the assembly, including its load. The maximum distance is 14.5 meters, applicable to all combinations of vehicles and rigid trailers.

Retractable axle – heavy duty trailer

Heavy duty trailers may have a retractable axle on the rear axle set if:

  • retractable shafts with automatic control to ensure that the shafts remain above ground within the appropriate legal weight limits and manufacturer’s limits, and
  • Front clearance and rear overhang limits are observed, both when the axle is on the ground and when it is retracted (note that the position of the rear axle may change depending on whether the axle is retracted or retracted). ground contact) and
  • such retractable shafts are certified to comply with the requirements in both of the above criteria.

Note: you can only operate the vehicle with the axle in the retracted position if the vehicle is not loaded.


Read more: what is the square root of 112 | Top Q&AA trailer where:

  • part of the trailer’s weight and its load are borne by the trailer, and
  • the coupling is not behind the rear axle of the towing vehicle or, if the towing vehicle is rigid and has more than one axle in its rear set, not more than 300 mm from the rear axle of the towing vehicle.
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Stability of heavy duty trailers

When loaded or unladen, heavy trailers with a total mass exceeding 10 tons must have a static rollover threshold (SRT) of at least 0.35g (where g is the acceleration due to gravity). SRT measures vehicle stability. Trailers with a body height or load height of 2.8 meters or more above the ground must also be certified that they have an SRT of at least 0.35g. CoF) test, the information from the SRT certificate will be imported into a new load certificate for that vehicle.

Trailers: truck-heavy trailer mass ratio

For a rigid vehicle (truck) towing a heavy trailer, the ratio between the overall mass of the trailer and the overall mass of the truck at any time should not exceed 1.5.This combination does not apply if the combined vehicle’s speed does not exceed 40km/h or if the vehicle is operating under an overload permit with an axle index above 1.1.

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