No through traffic allowed due to F1 Grand Prix at Silverstone on A43 in both directions between A422 (Brackley) and A5 (Towcester).
Only race spectators will be able to use this section of the A43. A one way system will be in place for traffic heading to Silverstone in the morning and away from Silverstone in the afternoon.
Diversion - Between M1 J15 using A508 and A422 via Old Stratford and A421 between Buckingham and the A43 just South of Brackley.
More top news
A mother from Birmingham has issued a warning after her daughter, 4, was bitten by a spider.
Slowly brightening up later in the day, with some warm sunny spells possible by evening.
Any mist and low cloud will clear during the morning, leaving bright or sunny spells.