The film often discussion forum on the automobile. A lot of people say, America car most not film, only black society film. I took some photos in the America, also by Google street view photographs were, indeed, in Washington DC, New York, California and other places, almost can not see the car; but it is said that in some of the southern city of window glass, film or darker car also has many.

Also someone says, America law does not allow the film. In fact, this is a misunderstanding. America state law prohibits only with metal film and the mirror, does not prohibit a color film. However, America states on film (or colored glass) transmittance has strict rules, and the car and SUV (Van) transmittance provisions are not the same. However, carefully read the provisions, we can find some interesting details:

1, the state of the front windshield film or glass colors are not required, generally are not allowed to the upper 4 - 6 inches wide, a reflective, may be in order to prevent the impact of the opposite vehicle sight. It seems you if you wish to use a windshield completely opaque also nobody tube, this is your thing, anyway, the police won't stop right in front of your car. On the rear windshield basically is not required, it may also be that the police will not stand in the rear of your car.

2, the strict regulations for the front side glass. Because the police are standing in front of the outside of the glass inspection vehicle.

3, California, New York, Pennsylvania, Michigan, Washington D. C., are the most economically developed area, population, crime is more, so the most stringent requirements on the front side of the rate of transparent glass, is 70%.

4, New Mexico, Arkansas, Florida, Colorado, Oklahoma and other states, mostly in the South or Midwest, population is relatively small, relatively hot weather, so the rate of the loose side of transparent glass, the lowest only 20% of new mexico. I have seen a number of New Mexico car photos, seems glass deep color is more. In particular, Washington State (not the capital Washington DC), although here pleasant weather, cloudy, but the transmittance is relatively loose, do not know the reason.

5, the transmittance refers to the film and glass on the overall effect together, not only refers to the film itself.

6, many of the state's light on the SUV rear window was loose requirement, permissible transmittance arbitrarily low rate, Is it right? Consider SUV often go to the field to run, some time in the sun?

7, according to the list, in some states, these Provisions are listed as state law (State Law).

So, America these laws is to ensure that the police can clearly observe the vehicle driver's every act and every move.

Below is USA California, New York and New Mexico on all window transmittance as well as the provisions of the state on the front side window transmittance (VLT- transmittance) regulations: