AUTO: SEP 18 IndyCar - GoPro Grand Prix of Sonoma

September 18, 2016: Graham Rahal in the Honda powered Rahal Letterman Lanigan Racing car #15 at turn 10 during warmup for the Verizon Indycar Series, GoPro Grand Prix of Sonoma held at Sonoma Raceway, CA. (Photo by Allan Hamilton/ Icon Sportswire)