Route
The road begins at the A1, just south of St Neots (and the junction with the A428 from Cambridge), at the Black Cat Roundabout. The road bypasses both Great Barford and Bedford to the south to reach the M1 at junction 13. From there, it swings up through the southern part of Milton Keynes, doubling as the local grid road H8 Standing Way. During this time it crosses the A5 (and connects to it via a short spur which is part of the V6 Grafton Street). Continuing westwards, it forms the Buckingham by-pass before joining the A43 (Northampton — Oxford) on the outskirts of Brackley.
(From there, the due westward route becomes the B4031 through Croughton, Aynho and Deddington to join the A361 to Chipping Norton).
The section from the A1 to the M1 is dual carriageway and fully grade-separated. There is a short section of single carriageway from the new flyover (beside Junction 13) to the south-eastern outskirts of Milton Keynes, where dual carriageway running resumes and continues as far as the southwestern outskirts. From here to the A43, the route is single carriageway, with the exception of the bypass around Tingewick.
Read more about this topic: A421 Road
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