Indianapolis Motor Speedway

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Will Power and Mike Conway crash during the Indianapolis 500 auto race at the Indianapolis Motor Speedway on Sunday, May 27, 2012. (AP Photo/LAT, Michael L. Levitt)

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Race fans cross the famous "Yard of Bricks" in front of the Pagoda on their way to their seats before the running of the 96th Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis on Sunday, May 27, 2012. (AP Photo/Darron Cummings)

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Owner Michael Andretti, left, talks with his son and driver Marco Andretti during practice for IndyCar's Indianapolis 500 race at Indianapolis Motor Speedway in Indianapolis on Saturday, May 12, 2012. (AP Photo/Darron Cummings)

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** FILE ** In this May 30, 2011, file photo, IndyCar driver Dan Wheldon, of England, poses with his family, wife Susie, left, holding Oliver, and Sebastian, right, next to the Borg-Warner Trophy during the traditional winners photo of the Indianapolis 500 auto race champion on the start/finish line at the Indianapolis Motor Speedway in Indianapolis. (AP Photo/Michael Conroy, File)

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Fans created a memorial at the main gate at Indianapolis Motor Speedway for driver Dan Wheldon, who was killed in a crash during an IndyCar race at Las Vegas on Oct. 16. The incident spurred the racing organization to enhance safety measures in advance of the 2012 season. (Associated Press)

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IndyCar driver Dan Wheldon, of England, drinks from a bottle of milk after winning the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis, Sunday, May 29, 2011. (AP Photo/Darron Cummings)

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IndyCar driver Scott Dixon (front left) of New Zealand leads the field down the main straightaway on the first double-file restart during the Indianapolis 500 auto race at the Indianapolis Motor Speedway in Indianapolis on Sunday, May 29, 2011. (AP Photo/Paul Sancya)

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IndyCar driver Helio Castroneves, of Brazil, drives through the first turn during practice for the Indianapolis 500 at the Indianapolis Motor Speedway, Thursday, May 19, 2011, in Indianapolis. (AP Photo/Michael Conroy)

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In this July 25, 2010, file photo, the field passes a half-full stand during the running of the NASCAR Brickyard 400 auto race at the Indianapolis Motor Speedway in Indianapolis. Indianapolis Motor Speedway CEO Jeff Belskus said that tickets sales for the July Brickyard 400 have been below that of last years race. (AP Photo/Darron Cummings, File)