HC Deb 09 November 1982 vol 31 c139W
Mr. Cartwright

asked the Secretary of State for Transport what evidence he has received about possible road safety dangers arising from the use of tinted windscreens in motor vehicles; and whether he is considering a ban on the use of such windscreens.

Mrs. Chalker

There is no recent evidence that impaired vision due to tinted windscreens is a contributory cause of accidents, but there were cases in the early 1970s of cars with excessively tinted glass being involved in accidents.

All but a very modest tinting of windscreens has been banned for some years. Since 1977 the windscreen glass in a defined area covering the principal field of view has had to satisfy a minimum light transmission factor of 70 per cent.; from 1984 this will be increased to 75 per cent. Clear glass corresponds to a light transmission factor of about 80 per cent. and I consider the very small amount of tinting which will be permitted acceptable, given that the glass does not scratch readily and that wipers are always available in wet conditions.