The increased length limit applies only to specified heavy vehicle combinations and conditions. Image: NHVRThe biggest overhaul of the Heavy Vehicle National Law in more than a decade has sparked plenty of questions. Here are 10 of the most common myths surrounding the new laws that come into effect from August 1 – and what the National Heavy Vehicle Regulator says the new rules actually say. Myth 3: Small operators don’t need to make changesThe amended HVNL applies to all heavy vehicle operators, including owner-drivers and small businesses. Myth 6: Every heavy vehicle can now operate at 20 metresThe increased length limit applies only to specified heavy vehicle combinations and conditions.