What are the national regulations on the light transmittance of car window films?

[VonAndres]

China's traffic regulations do not specify standards for car window films. The relevant regulations on car window film standards are stipulated in the "Safety Technical Conditions for Motor Vehicle Operation" (GB7258-2004): The driver's cab must ensure the driver's forward and side vision. The visible light transmittance of the front windshield and the glass areas outside the windshield used for the driver's viewing area must not be less than 70%. Mirror-like reflective sunshade films are not allowed on any car window glass. Car windows can be opened 7 days after applying the film, but the car should not be washed, as this may cause the film to peel off. Car window film refers to the film applied to the surface of car glass, and its functions include: 1. Blocking solar heat and glare; 2. Reducing the load on the car's air conditioning system, improving fuel efficiency, and enhancing driving comfort; 3. Blocking ultraviolet rays to protect the skin of passengers from UV burns and slow down the fading, aging, and cracking of interior materials; 4. Increasing driving safety by keeping glass fragments in place in case of breakage, preventing injuries; 5. Creating a private space to prevent others from peering in.