HC Deb 29 March 1974 vol 871 c223W
Mr. Hill

asked the Secretary of State for the Environment if he will reexamine the possibility of a motorway

Distance travelled due to driver reaction feet Vehicle Stopping Distance feet Total Distance feet
30 m.p.h. 30 67 97
40 m.p.h. 40 119 159
50 m.p.h. 50 185 235
60 m.p.h. 60 267 327
70 m.p.h. 70 364 434

In practice many vehicles will give 10–15 per cent. better performances than the minimum legal requirements provided the vehicles are properly maintained and tested on road surface of good adhesion.