Additionally, Seat belt webbing may exhibit signs of fraying or excessive wear. Prolonged exposure to sunlight and regular usage can deteriorate the material, compromising its strength. NHTSA has considered these questions and attempted to use plain language in promulgating this final rule. Please inform the agency if you can suggest http://www.drugoffice.gov.hk/gb/unigb/www.ledteks.com/seatbelt-and-safety-belt-webbing