HC Deb 20 January 1965 vol 705 c67W
74. Mr. Clive Bossom

asked the Minister of Transport if he will install an experimental system of sound warning by hooter on motorways when there is fog.

Mr. Tom Fraser

No. Audible warnings could dangerously startle some drivers and might not be heard by others in closed vehicles with heavy engine noises. They would disturb the locality without being of reliable benefit to traffic.