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A1 to close this weekend for major A428 project work

A1 Closed in both directions this weekend between Tempsford and Black Cat Roundabout. Official diversion pictured.

National Highways will close the A1 in both directions this weekend as part of the ongoing £1 billion A428 improvement project.

The closure, which runs from 9pm on Friday 7 November to 5am on Monday 10 November 2025, covers the section between Tempsford and the Black Cat Roundabout. It is necessary to allow the installation of a new culvert close to the A1 carriageway.

The A428 scheme, now more than halfway through and costing around £1 million per day, will eventually deliver a new dual carriageway linking the Black Cat Roundabout to Caxton Gibbet.

Diversions:

  • Northbound: Leave the A1 at Tempsford, continue north on Tempsford and St Neots Road, then head west along the A428 to rejoin the A1.

  • Southbound: Follow the same route in the opposite direction.

Drivers are advised to plan ahead, allow extra travel time, and follow diversion signs.

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