Kyle Larson, driver of the #32 Clorox Chevrolet, and Regan Smith, driver of the #7 Clean Coal Chevrolet, are involved in an incident at the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on Feb. 23, 2013 in Daytona Beach.

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Kyle Larson, Justin Allgaier and Brad Keselowski are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida.

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Medical personnel remove an injured fan from the stands following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida.

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Kyle Larson, Brad Keselowski, and Nelson Piquet Jr., are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida.

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Medical personnel remove an injured fan from the stands following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida.

Jonathan Ferrey/Getty Images

Medical officials remove an injured fan from the stands following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida.

Jonathan Ferrey/Getty Images

Medical officials assist fans in the stands following an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida.

Jonathan Ferrey/Getty Images

Kyle Larson and Brad Keselowski are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida.

Chris Graythen/Getty Images

Kyle Larson and Brad Keselowski are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida.

Chris Graythen/Getty Images

Brad Keselowski and Kyle Larson are involved in an incident at the finish of the NASCAR Nationwide Series DRIVE4COPD 300 at Daytona International Speedway on February 23, 2013 in Daytona Beach, Florida.

Matthew Stockman/Getty Images