Silverstone managing director Richard Phillips issued an "unreserved apology" to fans after the traffic mayhem that almost reduced him to tears.
Thousands of fans were left stranded in traffic jams outside the Northamptonshire track on Friday as the first two practice sessions ahead of Sunday's British Grand Prix unfolded under constant rain and reduced car parks to quagmires.
It has resulted in Silverstone losing 50% of parking space due to the damage caused, and in turn they are now asking fans with tickets for public car parks on Saturday to not turn up.
Phillips concedes the financial hit will likely run into seven figures.
Up to 20,000 Formula 1 fans are being warned not to attend the British Grand Prix qualifying sessions at Silverstone race track today as heavy rain on Friday has left some car parks unusable.
Thousands of Formula One fans are heading to Silverstone in Northamptonshire today ahead of free practice for the British Grand Prix.
Campsites and pubs close to the circuit will be busy over the race weekend, with more than 315,000 attending last year's event.
More than 28,000 racegoers are expected to camp around Silverstone this year.