Diversions, closures and speed restrictions

Check this page regularly for the latest updates on road closures, diversions, and speed restrictions

Diversions, closures and speed restrictions

Current closures

10 to 13 April - A1 southbound weekend closure from Wyboston to Tempsford

Closed for the weekend from 9pm Friday 10 to 5am Monday 13 April for road maintenance and resurfacing.

Diversion 

  • exit A1 at Wyboston interchange
  • take A428 towards St Neots
  • rejoin A1 at Tempsford via St Neots Road

See A1 southbound diversion route.

Closed overnight (8pm - 6am) from Monday 13 to Friday 17 April 20206 for new footpath and kerb installation.

Diversion

  • take B1040 north
  • at roundabout take A1198
  • rejoin A428 at Caxton Gibbet

See A428 diversion route map.


Closed overnight (9pm - 5am) from Tuesday 14 to Thursday 16 April 2026 for bridge beam deliveries.

Diversion 

  • exit A1 at Wyboston interchange
  • take A428 towards St Neots
  • rejoin A1 at Tempsford via St Neots Road

See A1 southbound diversion route.

Closed for the weekend from 8pm Friday 17 to 6am Monday 20 April 2026 for new footpath and kerb installation.

Diversion

  • take B1040 north
  • at roundabout take A1198
  • rejoin A428 at Caxton Gibbet

See A428 diversion route map.

Closed for the weekend form 9pm Friday 17 to 5am Monday 20 April 2026 for safety barrier and verge removal

Diversion

  • exit A1 at Tempsford Interchange onto St Neots Road
  • take A428 towards Wyboston
  • rejoin A1 at Wyboston Interchange

A1 northbound diversion route map.

Closed overnight (9pm - 5am) from Monday 20 April to Saturday 16 May 2026 for installation of of new street lighting, signage, and maintenance.

Diversion

  • take A428 towards Wyboston
  • join A1 northbound
  • exit A1 northbound onto A14 at Brampton
  • join A1198 towards Caxton Gibbet

See A428 overnight diversion route.

Closed overnight (9pm - 5am) from Tuesday 21 to Thursday 23 April 2026 for bridge beam deliveries.

Diversion 

  • exit A1 at Wyboston interchange
  • take A428 towards St Neots
  • rejoin A1 at Tempsford via St Neots Road

See A1 southbound diversion route.

Closed for the weekend form 9pm Friday 24 to 5am Monday 27 April 2026 for work on the new A1 underpass.

Diversion

  • exit A1 at Tempsford Interchange onto St Neots Road
  • take A428 towards Wyboston
  • rejoin A1 at Wyboston Interchange

A1 northbound diversion route map.

Closed overnight (9pm - 5am) from Saturday 25 to Sunday 26 April 2026 for tie-in work.

Diversion

  • take A1198 south
  • exit onto A603 towards M11
  • use M11 to rejoin A428

See A428 diversion route map.

Closed overnight (9pm - 5am) from Sunday 26 to Monday 27 April 2026 to switch traffic onto a new stretch of road.

Diversion

  • take A1198 south
  • exit onto A603 towards M11
  • use M11 to rejoin A428

See A1198 diversion route map.

Please remember that closures can change at short notice. You can check the latest information on our daily closures page or find live travel information on our Traffic England site. Our travel alerts give details of live incidents on our network.

Long term changes

Black Cat roundabout layout change - 24 November 2025

From Monday 24 November, we'll open new sections of road at Black Cat roundabout, linking with existing road networks. 

A1 southbound

We’re moving the A1 southbound onto a new stretch of road passing under the new east bridge at Black Cat roundabout.

Make sure you’re in the correct lane before you reach the junction:
  • left hand lane for A1 south, A421 or M1
  • right hand lane for A1 north, A421 or M1

A1 northbound

We’re moving the A1 northbound approach onto the new northbound on-slip at Black Cat roundabout.

Make sure you’re in the correct lane before you reach the junction:
  • left hand lane for A421 west and Bedford Road
  • right hand lane for A1 north

Map of Black Cat roundabout layout from November 2025.

Let us know what you think

Use our A428 Black Cat to Caxton Gibbet improvements feedback tool to have your say.

This tool features an interactive map, allowing you to click on specific locations to leave targeted comments or provide general feedback.

ECHO is a one-way feedback tool, so if you'd like a response to your feedback you can email the project team at info@a428.co.uk.

Planning diversions, traffic management and speed limits 

What you can expect to see

The A1, A421, and A428 will mostly stay open while we carry out our work.

There may be some overnight and full weekend closures from time to time. We'll need these for important tasks like:

  • connecting new and existing roads
  • building bridges
  • delivering large pieces of equipment or materials.

We're committed to being a good neighbour. That’s why we’re carefully planning our work to reduce any disruption to drivers and the local community.

Highest safe speed through roadworks

We’ve determined that a temporary speed limit of 40mph is needed to keep both road users and our workers safe.

This reduced speed limit helps junctions function as usual, which means we won’t need to close roads as often

How we choose diversion routes

We're dedicated to ensuring that any traffic diversions around road closures are safe and appropriate. We'll use diversion routes that can handle the type and amount of traffic being redirected.

The diversion routes will mainly follow major A roads to avoid heavy traffic on local streets. We'll work with local authorities to agree on the best routes.

These diversions are required by law, based on the development consent order (similar to our official approval or planning permission).

To minimise disruption, we will manage traffic carefully, providing clear signs and advance warnings to drivers.

 

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