Class A: Any tractor-trailer or combination of motor vehicle and towed vehicles where the towed vehicles exceed a total gross weight of 4,600 kilograms. Class A licence holders may also drive vehicles in Classes D, G, and A with condition (R). A Class A licence does not permit you to drive a bus carrying passengers, a motorcycle, or a moped.

Class A With Condition R: Drivers with a restricted Class A licence condition are prohibited from operating a motor vehicle pulling double trailers or a trailer with air brakes. Class A (with Condition R) licence holders may also drive vehicles in Classes D and G.

Class B: Any school-purpose bus with designed seating capacity for more than 24 passengers. Class B licence holders may also drive a vehicle in Classes C, D, E, F, and G, but not a motorcycle or moped.

Class C: Any regular bus with designed seating capacity for more than 24 passengers. Class C licence holders may also drive a vehicle in Classes D, F, and G, but not a motorcycle or moped.

Class D: Any truck or motor vehicle combination exceeding 11,000 kg, provided the towed vehicle is not over 4,600 kg. Class D licence holders may also drive a vehicle in Class G. A Class D licence does not permit you to drive a bus carrying passengers, a motorcycle, or a moped.

Class E: A school-purpose bus with a 24-passenger capacity maximum. Class E licence holders may also drive vehicles in Classes F and G, but not a motorcycle or moped.

Class F: A regular bus with a maximum 24-passenger capacity and ambulances. The Highway Traffic Act defines a bus as a "motor vehicle designed for carrying ten or more passengers and used for the transportation of persons." For example, a 15-passenger van is considered a bus and requires a Class F licence. Safety information on large passenger vans is available on the Transport Canada website. Class F licence holders may also drive a vehicle in Class G, but not a motorcycle or moped.

Z Endorsement: A Z air brake endorsement is required on a driver's licence to operate any air-brake-equipped motor vehicle. The Z endorsement can be combined with any of the class A, B, C, D, E, F, or G licences.