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
Four-day Harley Davidson event at Lincolnshire Showground begins today with thousands expected to attend
David 'Piggy' Powell has been at Northampton Saints for half a century - a former player, former coach and since the late 80s, groundsman.
Rather cloudy with patchy rain at first. Clear spells developing.