HC Deb 05 December 1985 vol 88 cc318-9W
74. Mr. Higgins

asked the Secretary of State for the Home Department over what distance police car sirens used in the Metropolitan police area can be heard under normal circumstances and under the most unfavourable circumstances.

Mr. Giles Shaw

I understand that under normal conditions in a busy London street the electronic METSOUND audible warning system can be heard by a pedestrian at a distance of between 200m. and 300m. The performance of the equipment is, of course, less satisfactory under less favourable conditions, but it is not possible to give precise estimates of performance characteristics under such conditions.