Is the car crash test really useful?

Car crash test is really useful, because during the crash, it will test the strength and materials. After the test, the damage degree of the material will be detected. If the hardness or other properties of the material are not up to standard, the hardness and properties will be increased in the later test materials. Until the ideal goal is achieved. Then, we will use these tested materials in our car. This will increase the safety of our car.