The A1 will be closed in both directions between Tempsford and Black Cat roundabout from 9pm on Friday 19th to 5am Monday 22nd September 2025.
Northbound traffic will be diverted as follows:
- off the A1 at Tempsford
- onto St Neots Road and joining the A428 at St Neots
- re-join the A1 northbound at the Wyboston junction
Southbound traffic will use the same diversion route in reverse.
A map of the diversion can be seen below:
