Like this one:
An automobile is propelled by a horse pushing from behind. A U-shaped member 4 is attached by its free ends to the automobile, the automobile pulling a trailer in which food for the horse can be placed. The horse is connected to the U-shaped member 4 in such a way that it can only reach the food by pushing against the U- shaped member and so propelling the automobile.
The ignition switch can be arranged to give a mild electric shock to the posterior of the horse when it is switched on. The brake pedal maybe linked by cables to halter around the neck of the horse.
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