HC Deb 27 March 1975 vol 889 cc258-9W
Mr. Skeet

asked the Secretary of State for the Environment what is the cost of electricity used in lighting three miles of motorway using either high or low pressure sodium lamps.

Mr. Carmichael:

The average yearly cost of electricity for a typical three-mile length of motorway is about £3,200 using low pressure sodium lamps. In the rare case of the use of high pressure sodium lamps the annual cost of electricity would be about £4,000 a year for three miles.