Automobile window tinting, by its nature, reduces the visible light transmittance through a car's windows. This can be a problem at night when other motorists must be able to see through the car in order to sense impending danger. Police officers must also be able to identify the passengers in a vehicle. Other concerns may be tinting film that is both very old and bubbling or peeling off, which would also lower visibility.
People generally get their vehicle windows tinted to perceive added value because it makes the vehicle look more sporty and also to help reduce the glare of the suns rays and prevent eye fatigue.
In limousines, windows are tinted to keep people from seeing the passengers. In the case of people who keep their work tools in the vehicle, windows are tinted to keep thieves from seeing if there is anything valuable to steal.
Window tinting keeps the car and its occupants cooler and helps save the interior of the car from damage and fading from the suns UV rays.
In case of an accident, window tinting will help hold shattered glass together and protect the occupants of the car.