What moving device did Leonardo da Vinci design that could travel without being pushed?

Leonardo da Vinci designed a self-propelled cart that could travel without being pushed.

His fifteenth-century drawing shows a three-wheeled vehicle powered by coiled springs. The springs were wound before operation and released energy through a system of gears, allowing the cart to move for a limited distance.

The cart may have been intended for theatrical performances or court spectacles rather than transportation. Its steering system also allowed the route to be programmed in advance, making it an early example of a vehicle with predetermined movement.

Leonardo did not build a surviving original, so modern reconstructions are based on the drawing and its mechanical details. The device is sometimes called the first automobile, but that description is informal because it had spring power rather than an engine.