Is it illegal to use one-way transparent film for car windows?

If the film is mirror-finished, it will violate traffic regulations. According to the Vehicle Operating Safety Technical Standards, the visible light transmission rate of the driver's view area and the area used for observing the rearview mirror should be no less than 70% for all window glass. Therefore, it is not recommended to use mirror-finished sunscreens for car windows. Car window film is a thin film that is affixed to the front and rear windshields, side windows, and sunroofs, which is also known as solar film or heat-insulating film. Its main function is to block ultraviolet rays, prevent glass from flying and causing injury, and reduce glare. Additionally, it can protect personal privacy by providing one-way transparency. It can also reduce damage to items and people caused by ultraviolet radiation, and lower the temperature inside the car by reflecting heat, reducing the need for air conditioning and thereby saving fuel. However, mirror-finished sunscreens can interfere with other drivers' views, especially in strong sunlight, which can pose a high risk of causing a car accident. In addition, opaque or mirror-finished films can hide vehicle overloading or illegal modifications, making it difficult for traffic police to manage. Therefore, it is illegal to use this type of film, and owners should comply with regulations when considering using it.

In summary, the use of one-way transparent film for car windows is illegal and may pose safety risks. It is important to understand the regulations and follow them to ensure safe driving.