Supplement Restraint System is additional safety equipment in a car. Such as airbags and seatbelts. Every person has a risk of having an accident while driving. This will lead to the risk of injury. Therefore, in a car should be equipped with Supplement Restraint System, such as air bags and seat belts. Air bags reduce the risk of injury when someone had an accident while driving. By having air bags mounted on a car, when the car suffered concussion, air bags inflate quickly in order to protect passengers clash with the interior of the car. The function of the air bag will be even better when teamed up with the function of the seat belt.Air bag will prevent passengers collided with a car's interior, and seat belt functions to hold the body of passengers being thrown forward. If both functions work well, it will greatly reduce the risk of injury significantly.