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A308(M)
Route information
Maintained by National Highways
Length	0.6 mi (970 m)
Existed	1971–present
Major junctions
East end	M4 Junction 8/9
Major intersections	M4 motorway A404(M) motorway
West end	Maidenhead (Braywick)
Location
Country	United Kingdom
Primary destinations	Maidenhead, Windsor, Bracknell
Road network
Roads in the United Kingdom Motorways A and B road zones
← A194(M) → A329(M)

The A308(M) is a motorway in Berkshire, England. It is 0.6 miles (0.97 km) long. It forms part of the Maidenhead bypass and runs from the M4 at junction 8/9 to the A308 south of Maidenhead town centre. The A308(M) is one of Britain's shortest motorways, and is generally considered to be the second shortest, after the A635(M) on the Mancunian Way.

History

In 1961 the A4(M) was opened and ran from the existing junction 7, through a junction with the A308 and ending at a junction with the A4. In 1963, the Slough bypass was opened to junction 7 and the A4(M) was renumbered M4, junction 8 being with the A308 and junction 9 with the A4.

The proposed route of the M4 was then changed to go south of Reading, instead of north of it. When the M4 was extended in 1971, a new junction was provided to connect with what would become a spur. This new interchange was built too close to the original junction 8, so this had to be closed. A new junction (numbered 8/9 so as not to confuse motorists) was built. The original M4 north of this was renumbered as the A423(M) and in the 1990s this was again reclassified as the A404(M). A new spur, the A308(M), was built to maintain access to the A308 and connected with the A404(M) and the M4 at the same grade separated roundabout.

Junctions

This article contains a bulleted list or table of intersections which should be presented in a properly formatted junction table. Please consult this guideline for information on how to create one. Please improve this article if you can. (December 2021)

Note: motorway has no junction numbers

Information above gathered from Advanced Direction Signs April 2011

See also

• List of motorways in the United Kingdom
• A404(M) motorway

References

1. "BBC Radio 4 - Radio 4 in Four - Ten speedy facts about motorways". BBC. Retrieved 3 August 2021.
2. ^ The Motorway Archive – M4 Dates Page Archived 4 January 2007 at the Wayback Machine

External links

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

• Motorways in England
• Roads in Berkshire