HC Deb 09 December 1974 vol 883 cc2-3W
23. Mr. Greville Janner

asked the Secretary of State for Industry by what percentage he estimates that industrial profitability would be affected by a reduction in the maximum speed limit on the roads to 55 mph.

Mr. Gregor Mackenzie

The effort entailed in making such an estimate would not be warranted because so many variables would have to be taken into account that the reliability of the estimate would be questionable.