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M31
Route information
Length	22.0 mi (35.4 km)
Status	Unbuilt
History	Never built; partially completed as A329(M) and A3290
Major junctions
southeast end	M25 motorway
Major intersections	M3 motorway M4 motorway
northwest end	M4
Location
Country	United Kingdom
Primary destinations	Bracknell Wokingham Reading
Road network
Roads in the United Kingdom Motorways A and B road zones

The M31 was planned as a Reading to M3 motorway which was dubbed the 'M3 – M4 link motorway'. It would have provided a direct high-speed route between the two motorways. The motorway was planned at the same time as the largely unrealised London Ringways scheme and an additional section was planned that would have taken the M31 south and east from the M3 to connect to the scheme's Ringway 4 (now the M25) providing a shorter route for traffic travelling between the west and Surrey and Kent.

Only part of the planned route was built; it bears the designations A329(M) and A3290. Had the motorway been constructed it would have provided an alternative to the south-west section of the M25, reducing the motorway journey between Reading and Byfleet by approximately 10 miles (16 km) and alleviating traffic on what is the M25's busiest section.

References

1. RAC foundation Archived 2007-08-29 at the Wayback Machine
2. Highways Agency Archived 27 September 2007 at the Wayback Machine

External links

• Pathetic Motorways
  • M31
  • M31 route map
  • Map of planned northern section of M31/A329(M)
• CBRD – A329(M)

v t e Motorways in the United Kingdom
Great Britain	M1 M11 M18 M180 M181 A1(M) A167(M) A194(M) A1077(M) M2 M20 M23 M25 M26 M27 M271 M275 M3 M32 A3(M) A38(M) A308(M) A329(M) M4 M40 M42 M45 M48 M49 A48(M) A404(M) M5 M50 M53 M54 M55 M56 M57 M58 A57(M) A58(M) M6 M6 Toll M60 M61 M62 M65 M66 M67 M69 M602 M606 M621 A64(M) A66(M) A627(M) M73 M74 M77 A74(M) M8 M80 M876 M898 A8(M) A823(M) M9 M90
Northern Ireland	M1 M2 M3 M5 M12 M22 A8(M)
Former	M10 M41 M63 M85 A18(M) A40(M) A41(M) A102(M) A601(M) A6144(M)
Unbuilt	M12 M15 M16 M31 M64 M4 relief road
Junctions ( Category)	Almondsbury Broxden Catthorpe Charing Cross, Glasgow Denton Island Handy Cross Longbridge Lydiate Ash Scotch Corner Spaghetti Junction Switch Island Thorney Thorpe Thurcroft
Bridges	Auchenshuggle Avonmouth Bromford Don Friarton Gathurst Kingston Medway to Nowhere Ouse Rakewood Scammonden Prince of Wales Severn Thames Thelwall Tinsley Queensferry Usk Weaver
Related articles	National Highways Traffic officers South Wales Trunk Road Agent Traffic officers Transport Scotland DfI Roads Preston By-pass Smart motorway Motorway service area List
Category Commons

51°24′58″N 0°48′15″W / 51.41602°N 0.80423°W / 51.41602; -0.80423

• Motorways in England
• Roads in Berkshire
• Roads in Surrey
• Cancelled highway projects in the United Kingdom