There may be situations where it is not required to prove negligent actions. Suppose, the accident occurred due to the malfunction of the car parts or if the car parts are defectively designed, there is no need to prove any negligence.
Car manufacturing companies will take every step to avoid any responsibility to pay for the damages. They will use arguments to avoid any liability such as the car driver was not driving properly and it was their fault. However, it will be clear from the evidence what caused the deadly collision.