The Black Cat roundabout, with vehicles driving through

About the A428 Black Cat to Caxton Gibbet improvements

National Highways is proposing to upgrade the route between the Black Cat roundabout and Caxton Gibbet roundabout with a new 10-mile dual carriageway and a number of junction improvements. The proposed scheme is estimated to cost between £810 to £950 million and, if given the go ahead, will improve journeys between Milton Keynes and Cambridge, bringing communities together and supporting long term growth in the region.

Existing A428 route (green) and new proposed work (orange)

National Highways is improving journeys between Milton Keynes, Bedford and Cambridge.

  • The A428 between St Neots and Caxton Gibbet is the only stretch of single carriageway between the M1 near Milton Keynes and Cambridge.
  • It is an important link between the M1 and the M11, connecting the communities of Bedford, St Neots, Cambridge and Cambourne.
  • Around 25,300 vehicles travel between Cambridge Road and Caxton Gibbet every day. With considerable local housing and job growth expected, this number is likely to grow to 32,900 vehicles by 2040.
  • People that use the A428 regularly experience congestion and delays, especially in rush hour. The situation is made worse by the lack of alternative routes.

Archaeological excavations are being carried out along the new proposed route, ensuring that sites of possible historical interest are identified and investigated.

Find out more about the proposed A428 Black Cat to Caxton Gibbet Improvement Scheme on the National Highways website.

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  • An archaeologist working on an Iron Age Roundhouse at Field 44 on the A428

    About Field 44

    We’ve been busy digging with the Cambridge Archaeological Unit as part of the wider programme of archaeological work for the proposed National Highways A428 Black Cat to Caxton Gibbet Improvement Scheme.
  • The highways to the past cover artwork, showing a road sign with the words 'Iron Age' and 'Roman Period'

    Highways to the Past

    Ever wondered how we know where to dig? What’s it like working on an archaeological site?