Light, medium and heavy vehicles that have exterior mirrors on both sides of the bodywork may have tinted or polarised windows, through the installation of non-reflective, non-metallic and non-mirrored films attached to the inside surface of the windows, except for the windscreen or any factory-fitted tinted windows authorised in accordance with the above paragraph. Films must be attached in a single piece per window and must be installed in such a way that there are no imperfections or anything else that may hinder the full view. Films installed on the rear window of vehicles shall not obstruct the full view of the effective illuminated surface of the third brake light. Films shall not be coloured amber, yellow, red or blue or any of their shades.