Sonoma Raceway will host the GoPro Grand Prix of Sonoma Verizon IndyCar® Series season finale this weekend, Aug. 28-30.

Traffic on the surrounding roadways may be impacted, particularly the two-lane stretches of Highways 37 and 121. The raceway expects traffic to be most affected during the following days/times:

  • Friday, Aug. 28: Raceway events should not impact road conditions.
  • Saturday, Aug. 29: Raceway events should not impact road conditions.
  • Sunday, Aug. 30: Between 9 a.m.-2 p.m. and 5 p.m.-8 p.m.

The heaviest traffic is expected on Sunday, and race fans heading to the track are advised to arrive early to avoid traffic and enjoy the complete race-day experience before the green flag falls at 2 p.m.

A primary focus this year is to encourage non-race attendees to utilize alternative routes in and out of the Napa and Sonoma Valleys.  In past years, up to 85% of the drivers passing the raceway on Highways 37 and 121 during peak entry and exit times are not attending the event. When combined with race traffic, the results can bring hours of congestion for all drivers.

The raceway's traffic management plan includes an array of measures intended to divert ambient traffic from the adjacent highways on race day. Some of these initiatives include:

  • A total of 46 changeable message signs—nine more than last year—will be distributed along highways up to a 15-mile radius around the facility directing ambient traffic away from Highways 37 and 121.
  • Seven signs placed along Highway 121 to direct raceway guests to the appropriate entry gate.  The signs will also help explain lane delineation for raceway and Sonoma/Napa traffic.
  • The raceway will employ a traffic manager, who will work closely with a CHP officer to provide real-time direction to maximize ingress and egress for raceway traffic.

Sonoma Raceway has worked closely with the CHP and Caltrans to develop and execute this plan, which will utilize more than 30 CHP and Caltrans workers on race day.

The raceway also added the popular Raceway Fun Train to IndyCar race day for the first time this year. This mass transit option, which has been utilized the past three years at NASCAR, will bring race fans to the track from Sacramento, Davis and Suisun by rail.

To ensure sufficient parking for guests with disabilities, Sonoma Raceway will continue to work with the Sonoma County Sheriff's Office on a stringent placard check.  Sheriffs will check each car and driver for its Handicap Placard, matching paperwork with name and placard number and a valid Driver's License. Persons displaying fake or placards that are not their own will be fined, ticketed and required to appear in court.

For more information about the GoPro Grand Prix of Sonoma, visit or call 800-870-RACE.