A vehicle engine is an electrical machine used in industries such as car production, garages and machine shops, to quickly move cars from one place to another. Vehicle transporters are specially designed to move heavy vehicles with minimal effort. Diesel fuel is widely used in transportation vehicles, such as trucks with trailers, buses, ships, and trains. It contributes less carbon dioxide to the environment; diesel creates more organic compounds and nitrous oxide.
A vehicle is a machine for moving people and things. A horse can move people and things, but it's an animal, not a machine or a vehicle.