According to the information provided on the website of Payless Driving School, a Heavy Rigid (HR) truck is a commercial vehicle with a Gross Vehicle Mass (GVM) of over 8 tonnes. This type of vehicle typically has three or more axles and is commonly used for transportation of goods, construction, and other heavy-duty tasks.

To operate a Heavy Rigid Truck in Australia, drivers must hold a valid HR truck license. This license requires drivers to have completed a minimum of 12 months driving experience in a lower class of vehicle and undergo training with an accredited provider.

The training program for the HR truck license covers important topics such as vehicle control, hazard perception, and road safety, as well as how to operate heavy vehicles safely and efficiently. The program may also include load restraint, fatigue management, and vehicle maintenance.

Overall, Heavy Rigid Trucks play a crucial role in the transportation and construction industries in Australia. Drivers who hold an HR truck license have the necessary skills and knowledge to operate these vehicles safely, ensuring the safety of themselves and other road users.