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Department of Transport and Main Roads

Heavy motor vehicle types and definitions

Listed below are definitions of the various heavy motor vehicles and the corresponding inspection sheet for these vehicle types:

Truck

Photograph of side view of a rigid truck
Caption—example of rigid truck

Prime mover

  • A prime mover is a heavy motor vehicle designed to tow a semi-trailer
  • Semi-trailers are connected by a fifth wheel on the back of the prime mover
  • Complete prime mover inspection sheet (F2875)

Photograph of side view of a prime mover
Caption—example of prime mover

Bus

Photograph of front and side of bus
Caption—Example of bus

Articulated bus

  • An articulated bus is a bus with 2 or more rigid sections connected to one another in a way that allows:
    • passenger access between the sections
    • rotary movement between the sections
  • Complete articulated bus inspection sheet (F2873)

Photograph of the side view of an articulated bus
Caption—Example of articulated bus

Amphibious vehicle/vessel

Photograph of 2 amphibious vehicles parked on the ground
Caption—Example of amphibious vehicle/vessel

Motorhome

  • A motorhome is a motor vehicle with a GVM >4.5t and is manufactured to include accommodation space which contains at least:
    • a table (may be easily removable)
    • sleeping facilities
    • cooking facilities
    • storage
    • a fire extinguisher
    • an outward opening or sliding door opening to the left or rear of the vehicle that allows clear and unobstructed access to the cabin
  • The number of transport seats in the vehicle must be equal to or exceed the number of sleeping positions (for example, sleeping positions for 4 people must have a minimum seating capacity of 4)
  • If the vehicle has a possible dual purpose, the vehicle must be registered as a truck
  • Complete motorhome/campervan inspection sheet (4550)

Photograph of front view of a motorhome
Caption—example of motorhome

More information

Last updated
2 July 2026