Under certain circumstances and depending on the vehicle type, a vehicle may not need to be registered.
These include:

• agricultural equipment - vehicles without automotive power built to perform agricultural tasks off road such as, cultivating land, growing and harvesting crops and rearing livestock.
• trailers carrying harvester combs
• bulk field bins for holding grain
• bulk fruit bins
• trailers (other than trailers specifically built to carry a boat) that is not used in the course of trade and:
  - weighs less than 200 kilograms empty
  - is not wider than the vehicle towing it
  - is not more than 3 metres long including the drawbar and any load on the trailer
• trailers that are being towed by a registered tow truck
• motor vehicles being towed on a highway*

*the number plate of the towing vehicle must be clearly visible when towing an unregistered vehicle. The registration number of the towing vehicle can be painted or otherwise displayed on the rear of the towed vehicle so the number is clearly distinguishable from a distance of 20 metres.

These are vehicles that are not considered to be motor vehicles by law and therefore are also not required to be registered.