§ 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.