Police are warning motorists to steer clear of Silverstone and surrounding areas in Northamptonshire unless they are going to the British Grand Prix.
Police monitor roads around the circuit to keep traffic moving
Drivers are reminded roads around the circuit will be busy all weekend and the A43 between the M1 at junction 15a and the M40 at junction 10 are closed.
In previous years this has only happened on the Saturday and Sunday.
Due to the increased number of tickets sold - 300,000 people are expected - road closures started on Friday.
Non-race traffic will be diverted from junction 15 of the M1 along the A508, A422 and the A421.
A group set up to look at traffic arrangements said it was confident access into the circuit would be eased and disruption to the surrounding villages and residents kept to a minimum.
Northamptonshire Police have set up a control centre with CCTV covering roads in the area and the car parks at the Silverstone circuit.
Sgt Nick Gough said: "The event is one of the most important in this area.
"We want to ensure everything is kept running as smoothly as possible so that we can keep it here for years to come."
The police advice is to stay away from the area unless you are going to the Grand Prix event.