The following is from Mazda Raceway...
Mazda Raceway Laguna Seca announced that for fans wishing to drive their cars to this year's Red Bull U.S. Grand Prix, additional automobile parking spots have been added.
A limited amount of on-site automobile parking can be purchased with two options available: $30 for a 3-day parking pass and $20 for Sunday-only parking. The area is located on Wolf Hill to the west of the track.
For motorcycles there are a few preferred paved spots left near the Red Bull Energy Center that are valid for all three days of the event and cost $50.
Tickets, additional event information, parking directions and information for the 2009 Red Bull U.S. Grand Prix at Mazda Raceway Laguna Seca are available by calling (800) 327-SECA or online at http://www.mazdaraceway.com/.