HC Deb 12 January 1976 vol 903 c29W
Mr. Richard Wainwright

asked the Secretary of State for the Environment what are the minimum acceptable widths of carriageway for class A trunk roads in (a) the United Kingdom and (b) West Yorkshire.

Mr. Marks

The standard width of carriageway for new two-lane roads is 7.3 metres (24 ft.). Present advice for existing roads states that light traffic flows can be accommodated on narrower two-lane roads, but for safety reasons 5.5 metres (18 ft.) is regarded as a normal minimum. These are national standards.