1. The waist belt should be fastened to the lower part of the hip bone and just in contact with the femur. In the event of a collision, the impact force acts on the bones of the pelvis, preventing the seat belt from tightening the abdomen and causing serious injury.
2. The shoulder harness should be attached to the shoulder and across the chest. These parts of the human body are able to withstand the restraint of the seat belt.
3. To fasten the waist belt, pull the shoulder belt up while pulling down the waist belt at the buckle end.