|From:||Maidenhead Thicket (SU857809)|
|To:||M4 Jct 8/9 near Holyport (SU886786)|
|Length:||2.4 miles (3.9 km)|
|Met:||A4, A423, M4, A308(M)|
|Former Number(s):||M4, A4(M)|
|Now part of:||A404(M)|
|Route outline (key)|
A423(M) is a former number of the motorway link running southeast from the A4 and the eastern end of the A404 to junction 8/9 of the M4. It was originally a part of the A4(M) before being renumbered M4, then A423(M), and most recently A404(M) when the routes of the A423 and A404 were altered.
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