www.nhvr.gov.au/road-access/local-government-road-managers/resources/processing-refusals-under-the-hvnl
if a PBS level 1 vehicle is 20m in length and exceeds mass only, the refusal must be specific to the mass as the vehicle can operate under the HVNL (at 20m without a permit). Refusing a heavy vehicle at a requested mass limit assessed as likely to damage road infrastructure
