The soapbox 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 soapbox cars are built by teams, and each must have functioning brakes and steering. Teams are limited to 5 members total and three team members maximum may sit in the car. The rest of the team members who are not driving can be pushers in the 10-yard push zone!