Which of these damages to the safety belts indicates an absolute need to replace the belt with a new one?

Seat belts are a key life-saving feature, which is why they must be in perfect condition. Any mechanical damage, such as abrasions, narrowing, or tears, drastically weakens the strength of the belt webbing. In the event of an accident, even with seemingly minor damage, the belt can break and fail to work correctly, leading to a risk of serious injury.