These vehicles, can be Buses, heavy rigid tray trucks, heavy tip trucks and Semi-Trailer“Prime Movers (when without trailer).Ī Heavy Rigid ‘Class HR’ covers a rigid vehicle with 3 or more axles and a GVM of more than 8 tonnes.Īny towed trailer must not weigh more than 9 tonnes GVM.Īlso includes articulated buses and vehicles in class ‘MR’.Heavy Rigid vehiclesare also commonly equipped with two different types of gearboxes, these are:“Automatic/Synchromesh”such as anEaton Gearbox, which is found to be more often fitted to European Trucks.ĭrivers with manual car licence are more easily able to adapt to this style of gearbox. Heavy Rigid vehicles are trucks that has three or more axles and a Gross Vehicle Mass (GVM) over 8 tonnes.