Road tractors for semitrailers, with only sparkignition internal combustion piston engine as motor for propulsion (or other not covered by preceding subheadings)
Road tractors for semitrailers, with both compressionignition internal combustion piston engine "diesel or semidiesel" and electric motor as motors for propulsion
Road tractors for semitrailers, with both sparkignition internal combustion piston engine and electric motor as motors for propulsion
Road tractors for semitrailers, with only compressionignition internal combustion piston engine "diesel or semidiesel"
Road tractors for semitrailers, with only electric motor for propulsion