The following description was taken from Heavy Vehicles Tailgating Through Safety Zones – NSW Government :
Heavy Vehicle Tailgating
Roads and Maritime Services (RMS) is concerned about the dangerous behaviour of a small number of drivers of heavy vehicles tailgating through safety zones (this includes point to point speed camera and SafetT-Cam locations).
Heavy vehicle drivers do this to try to avoid detection for speeding compliance and fatigue management offences and prevent the identification of unregistered vehicles.
This unacceptable behaviour is engaged in by only a small minority of drivers but it has serious safety implications for all other road users. The behaviour of a few reflects poorly on the large majority of drivers who obey the road rules and take road safety very seriously.