The soap box derby is a motorless car race. The cars only accelerate with the help of gravity. The slope of the hill helps propel the cars around corners or through obstacles without using an engine or motor. All soap box cars are built by the teams, and each must have functioning brakes and steering. Cars start on a ramp at the top of a hill with 2-3 racers going per run. When the cars are released, racers maneuver down the course trying to be the fastest team to the finish line!