§ Mr. Higgins
To ask the Secretary of State for Transport when his Department's experiment to ascertain the effect on vehicle speeds of substituting 70 mph road signs for white circles with a black diagonal stripe took place; what the result of the experiment has been; and if he will place the data collected in the Library.
§ Mr. Atkins
An experiment to test the effect of 70 mph repeater signs has been carried out on a stretch of the M1 and the results are now being assessed. Initial indications are that these signs had no effect on the speed of the majority of vehicles. When a report has been prepared I shall place a copy in the Library.