In a travel alert on its website, National Highways says:
"Road users are advised to follow the Hollow Diamond diversion symbol on road signs:
- Exit the M40 northbound at J10 and join the A43 northbound
- Continue on the A43 northbound towards Brackley
- At the roundabout with the A422 near Brackley, turn left to join the A422 north-westerly and continue onward to then re-join the M40 at J11.
National Highways asks drivers whose routes are affected to "please allow extra journey time".
"Plan ahead, you may wish to re-route or even delay your journey."
You can find further information from National Highways by visiting their www.trafficengland.com website and travel apps, or via their regional X feed.
They also have contact centre team is available 24/7 to provide up to the minute information on 0300 123 5000.
