Just a point worth mentioning and clearing up a few inconsistencies on this thread. Tinting the front passenger side/drivers side windows, and obviously the front windscreen is COMPLETELY ILLEGAL REGARDLESS OF ANY SORT OF %. Some cars come with a factory tint on these, but they are normally just a greenish/blue tinge rather than a grey/black tint. Traffic police cars carry a light measuring device which allows them to determine how much your tint allows natural light filter through, if it fails the roadside test, they have a number of options available to them in regards tohow they deal with the matter, from removing it there and then, to reporting you for summons!