Is it advisable to use cushions on the seats?

Is it advisable to use cushions on the seats?
A)Yes, to avoid fatigue.
B)Yes, it improves visibility and safety when driving.
C)No, it may affect the effectiveness of the belt.Correct
It is not advisable to use cushions, as they alter the correct posture and create slack with the seat belt. This slack can cause the dangerous "submarine effect", in which the body slides under the belt strap in the event of a collision. As a result, the belt loses its effectiveness and serious injuries may occur.