Class 1: Motorcycle
Class 2: Passenger cars
Class 3: Other 2-axle, 4-tire single unit vehicles
Class 4: Buses
Class 5: Trucks: bob-tails, tractor pulling other unit in a saddle mount position, floating axles only count when in the down position
Class 6: 2 axle, 6 tire, single unit truck
Class 7: 3 axle, single unit truck
Class 8: 4 plus axle single unit truck
Class 9: 4 or fewer axle single trailer truck
Class 10: 5 axle single trailer truck
Class 11: 6 plus axle single trailer truck
Class 12: 5 or fewer axle multi-trailer trucks
Class 13: 6 axle multi trailer trucks
Class 14: 7 plus axle multitrailer trucks
