The policing operation at Silverstone Circuit is well under way as the second day of the event takes place.
Thousands more people will be arriving at the Northamptonshire circuit during the course of the day with police leading a massive multi-agency security operation designed to ensure racegoers have an enjoyable and safe visit.
This year there has been a significant uplift in security and racegoers can expect to see more armed as well as unarmed police officers around the circuit over the weekend.
An ANPR operation is also taking place throughout the weekend in order to identify any vehicles that are known to have connections with criminality and officers will also be patrolling campsites as well park and ride facilities.
Event commander, Supt Chris Hillery, head of local policing, said: "People can expect more security generally and visitors should be prepared for bags to be searched going into the circuit.
"Our advice would be to leave a little earlier as it may take a bit longer than previous years to enter the circuit.
"We have a large number of officers, including specialist officers, on duty this weekend and this is a great opportunity for Northamptonshire Police
to show the very best of UK policing to the world. This is the UK's biggest sporting event in terms of visitors and we have planned accordingly for that.."
People camping during the event are being advised to make sure their belongings are as secure as possible when they go to sleep and when they leave their tents.
Visitors are also reminded they do not need to bring lots of cash to the event but make use of the cashpoints on the site rather than carry lots of
At midday today, police had recorded a total of four crimes, all thefts from motor vehicles, and made one arrest.
More crime prevention advice is available at northants.police.uk/Silverstone or by following @northantspolice on Twitter.