HC Deb 30 November 1987 vol 123 c425W
32. Mr. Higgins

To ask the Secretary of State for Transport if he will make it his policy to place speed limit signs reading 70 on motorways at appropriate places, and to replace with a 70 sign any existing signs which comprise a black diagonal stripe on a white circle.

Mr. Peter Bottomley

We are planning an experiment with 70 mph signs on a stretch of motorway. We need to discover whether such signs have a significant effect on vehicle speeds. For the present, the signing system of national speed limits on motorways remains unchanged.