List of motorways in the United Kingdom

• Single digit motorways
  • M1, the eastern north-south motorway linking London and Leeds and continuing north to the A1.
  • M2, in Kent from Rochester to Faversham.
  • M3, linking Southampton and London.
  • M4, linking London and south Wales.
  • M5, linking Exeter and the south-west of England with Birmingham and the Midlands.
  • M6, the western north-south motorway linking the M1 at Rugby and Carlisle.
  • M8, linking Edinburgh and Glasgow.
  • M9, linking Edinburgh and Stirling.

• Two digit motorways
  • M10, a short spur from the M1 to St Albans.
  • M11, linking London and Cambridge.
  • M18, linking the M1 at Rotherham and the M62 at Goole, South Yorkshire.
  • M20, linking London (Swanley) and Folkstone.
  • M23, linking London (Coulsdon) to beyond Crawley.
  • M25, the London orbital motorway.
  • M26, a short link between the M25 at Sevenoaks and the M20 before Maidstone.
  • M27, the south coast route running from Cadnam, west of Southampton, to Portsmouth.
  • M32, a spur from the M4 to central Bristol.
  • M40, linking London and Birmingham and linking to the M42 Birmingham orbital motorway .
  • M42, The southern and eastern part of the Birmingham orbital motorway extending north towards Ashby-de-la-Zouch and west to the M5.
  • M45, a short spur from M1 north of Daventry towards Coventry.
  • M48, the Severn Bridge, linking Thornbury and Newport, Monmouthshire over the River Severn. This used to be the M4 before the Second Severn Crossing was built.
  • M49, a short link from M5 to M4 west of Bristol.
  • M50, linking the M5 at Tewkesbury to Ross-on-Wye.
  • M53, linking Chester and Birkenhead.
  • M54, linking M6 north of Birmingham and Telford.
  • M55, linking Blackpool and M6 at Preston.
  • M56, linking Manchester and Chester.
  • M57, a Liverpool bypass running north west from the M62.
  • M58, linking Wigan and northern Liverpool.
  • M60, the Manchester orbital motorway.
  • M61, linking Preston and Manchester.
  • M62, linking Liverpool and the approaches to Kingston-upon-Hull, the trans-Pennine link.
  • M65, linking Preston and Colne, Lancashire.
  • M66, linking Rawtenstall and M62 at Manchester.
  • M67, linking the M60 at Denton to Hyde in Greater Manchester.
  • M69, linking Leicester and Coventry.
  • M73, linking Cumbernauld to the M74.
  • M74, linking Glasgow and Abington in South Lanarkshire, where the A74(M) takes over.
  • M77, linking Glasgow and Newton Mearns.
  • M80, linking Glasgow and Stirling.
  • M90, linking the Forth Road Bridge and Perth, Scotland.

• Three or more digit motorways and spurs
  • M180, from the M18 at Thorne towards Grimsby and the A15 to theHumber bridge.
  • M181, the Scunthorpe spur from the M180.
  • M271, the Totton, Southampton spur from the M27
  • M275, the Portsmouth spur from the M27
  • M602, M62 spur into Manchester.
  • M606, M62 spur at Bradford.
  • M621, M62 spur at Leeds.
  • M876, a short link between motorways in the Falkirk area.
  • M898, the Erskine Bridge approach road.

• Upgraded A-road designations
  • A1(M), representing the parts of the A1 road between London and Newcastle-upon-Tyne that have been upgraded to motorway.
  • A167(M) in central Newcastle-upon-Tyne.
  • A194(M) spur from the Newcastle-upon-Tyne stretch of the A1(M) running towards the Tyne Tunnel.
  • A3(M), a short stretch of the A3 road by-passing Waterlooville and Havant, that has been built to motorway standards.
  • A329(M), linking Bracknell and Reading.
  • A38(M), a spur from the M6 to central Birmingham, also known as the Aston Expressway. It is unique in having no central reservation.
  • A58(M) is the western part of the Leeds inner ring road.
  • A6144(M), the longest single-carriageway motorway spur in the United Kingdom from the M60 north of Sale towards Carrington
  • A64(M) is the eastern part of the Leeds inner ring road.
  • A66(M) is a short spur from the A1(M) to Darlington
  • A74(M), linking Abington in South Lanarkshire at the end of the M74 with Carlisle.

• Roads which used to be motorways but have been downgraded
  • A329(M) from Winnersh to Reading, now the A3290. Downgraded to permit Reading council to dedicate one lane for buses.
  • A40(M) London Westway, now the A40.
  • A41(M) Tring bypass, now the A41.
  • M41 was a spur from the London Westway.

• British Road Numbering Scheme
• UK topics