Advertising signs fixed to trailers are only permitted when the trailer is being towed behind a vehicle or is parked on the property of the business premises being advertised.
If the trailer is parked on the side of the road it will require a resource consent for each and every parking site.
Advertising signs on vehicles in public places generally require permission as a 'commercial activity'. However, the following vehicles are exempted from this requirement:
The maximum size allowed for mobile signs is 1200mm vertical and 600mm horizontal. No permit is required but both the owner and the carrier must ensure that the board does not cause any danger to pedestrians.