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soap box Soap box car in Oregon A soapbox car also known as a gravity racer is a small nonmotorized vehicle that is usually made from a wooden crate or a box and is designed to be powered only by gravity. Soapbox cars are typically used for racing with participants competing against each other in downhill races. Soapbox cars are usually built by hand with wheels brakes steering mechanisms and other components added to the basic box or crate structure. They are often decorated with paint or other materials to make them look more interesting or to represent a particular theme or design.