Nascar Sprint Cup Series

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Driver Jimmie Johnson (48) during a NASCAR Sprint Cup Series auto race at Kansas Speedway in Kansas City, Kan., Sunday, Oct. 21, 2012. (AP Photo/Colin E. Braley)

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Dale Earnhardt Jr. pauses as he talks about missing the next two races with his second concussion in the past six weeks during a news conference prior to practice for Saturday's NASCAR Bank of America 500 NASCAR Sprint Cup series auto race in Concord, N.C., Thursday, Oct. 11, 2012. (AP Photo/Chuck Burton)

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FILE - In this July 13, 2012, file photo, Kyle Busch prepares for practice for a NASCAR Sprint Cup Series auto race at New Hampshire Motor Speedway in Loudon, N.H. Busch is looking toward the AdvoCare 500 auto race on Sunday, Sept. 2, at Atlanta Motor Speedway as an opportunity to boost his position as he clings to one of the wild card spots for the 12-driver Chase for the Sprint Cup championship. (AP Photo/Jim Cole, File)

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Denny Hamlin drives out of the first turn during practice for Sunday's NASCAR Sprint Cup Series auto race at the Indianapolis Motor Speedway in Indianapolis, Saturday, July 28, 2012. Hamlin won the pole for the race. (AP Photo/AJ Mast)

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Mark Martin smiles after winning the pole during qualifying for Saturday's NASCAR Sprint Cup Series auto race at Richmond International Raceway, Friday, April 27, 2012, in Richmond, Va. (AP Photo/Autostock, Nigel Kinrade)

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This April 26, 2009, file photo shows Carl Edwards hitting the fence during a crash on the last lap of the Aaron's 499 NASCAR Sprint Cup Series race at Talladega Superspeedway, in Talladega, Ala. The death of Indianapolis 500 winner Dan Wheldon has sparked safety discussions throughout motorsports just as NASCAR heads to one of the fastest tracks on its circuit. (AP Photo/Rainier Ehrhardt)