definition
strict definition
vehicle assembly
An industrial facility manufacturing motorized vehicles, including road vehicles, trains, and aircraft.
A vehicle assembly plant is an industrial facility for the manufacture of automobiles, trucks, buses, motorcycles, trains, aircraft, or any other type of motorized vehicle.
The vehicle can travel on roads, rails, or through the air. The common condition is manufacture of motorized vehicles.
A factory making mechanical vehicle parts has a separate machine assembly meaning. This vehicle-assembly usage concerns production of the vehicles themselves.