|Length:||0.6 mi (1.0 km)|
|Existed:||1971 – present|
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.
|Eastbound exits||Junction||Westbound exits|
|Road continues as A308 to Maidenhead, Windsor
A330 to Ascot and Bracknell (A3095)
|A308 & A330
|London, Reading (M4) A308(M), Oxford A404(M)|
|Maidenhead, Windsor A308, Ascot A330, Bracknell A3095||Start of motorway|
|Start of motorway
Maidenhead (Central) A308(M)
|The West M4(W), London M4(E)
High Wycombe A404(M)
Information above gathered from Advanced Direction Signs April 2011
|Wikimedia Commons has media related to A308(M) motorway.|