Will the airbag serve its function during an accident, if you fail to fasten the seatbelts?

The airbag and seat belts are complementary systems that must work together to provide effective protection. The function of the seat belts is to decelerate the body's momentum and keep it in the correct position in the seat during a collision. Without fastened seat belts, the body strikes the airbag deploying at a speed of approx. 300 km/h with enormous force, which, instead of providing protection, leads to very serious head and spinal injuries.