What was Leonardo da Vinci’s wheeled machine designed to do without a person pushing it?

Leonardo da Vinci’s wheeled machine was designed to move under its own power.

The self-propelled cart appears in drawings from the late fifteenth century. It used coiled springs as an energy source, with the stored force transmitted through gears to the wheels. The design also included a steering mechanism and a system for setting the route before release. Because the cart could begin moving without someone pushing it, it is often described as an early robot or precursor of the automobile.

Leonardo did not leave a complete written explanation proving exactly how every part was intended to work. Modern reconstructions have been built from the surviving drawings, and several have shown that a spring-powered cart based on the design can move. The original purpose is uncertain; suggestions include theatrical effects, entertainment, and ceremonial use.

It is misleading to call it the first car in the modern sense. It had no combustion engine, passenger cabin, or road-transport system. Its significance lies in combining stored mechanical energy, gearing, steering, and autonomous motion.