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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.
Around 100,000 people are expected to descend on Silverstone in Northamptonshire this weekend for the British Grand Prix. Practice gets underway today with qualifying tomorrow and the race on Sunday.
Three local teams are taking part, Red Bull from Milton Keynes, Mercedes from nearby Brackley and Force India, which based just outside the circuit.
The wretched British summer wreaked havoc over Silverstone as first practice for this weekend's grand prix was almost a total washout. As rain poured the teams decided to remain dry in their garages despite the tens of thousands of fans packed around the Northamptonshire circuit.
The only action during the opening 75 minutes was an installation lap apiece from all the drivers bar Lotus' Kimi Raikkonen and Jean-Eric Vergne in his Toro Rosso.
It was Vergne's team-mate Daniel Ricciardo who ultimately took the lead. Only 11 drivers bothered to post a time.
Latest ITV News reports
The British Formula One Grand Prix returns to Silverstone in Northamptonshire this weekend.