Question to the Department for Transport:

To ask the Secretary of State for Transport, if he will make an estimate of the number of miles of (a) dual carriageway and (b) motorway in each (i) parliamentary constituency and (ii) local authority area in (A) 1979, (B) 1997, (B) 2010 and (D) 2021.

The Department publishes National Statistics on Road Length in Great Britain. Data is available by (a) dual carriageway and (b) motorway in each (ii) local authority area in (C) 2010 and 2020. Data for (D) 2021 will be published in Spring 2022. Data for the above can be found in the attached Annex A.

Data is not held by (i) parliamentary constituency or for (A) 1979 and (B) 1997. Statistics on Road Length are not available prior to 2005.