Daytona 500

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Crew members work on pit road under threatening skies during practice for Sunday's NASCAR Daytona 500 Sprint Cup series auto race in Daytona Beach, Fla., Friday, Feb. 21, 2014. (AP Photo/Terry Renna)

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Austin Dillon climbs into his car before practice for Sunday's NASCAR Daytona 500 Sprint Cup Series auto race at Daytona International Speedway in Daytona Beach, Fla., Wednesday, Feb. 19, 2014. (AP Photo/Terry Renna)

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Danica Patrick prepares to climb into her car for practice for Sunday's NASCAR Daytona 500 Sprint Cup series auto race at Daytona International Speedway in Daytona Beach, Fla., Wednesday, Feb. 19, 2014. (AP Photo/John Raoux)

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Dale Earnahrdt Jr. watches from the top of his transporter during practice for Sunday's NASCAR Daytona 500 Sprint Cup Series auto race at Daytona International Speedway in Daytona Beach, Fla., Wednesday, Feb. 19, 2014. (AP Photo/Terry Renna)

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Parker Kligerman (30) slides on his roof after crashing during practice for Sunday's NASCAR Daytona 500 Sprint Cup Series auto race at Daytona International Speedway, Wednesday, Feb. 19, 2014 ,as Dave Blaney (77) drives past. (AP Photo/News-Journal, Nigel Cook)

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Parker Kligerman (30) gets airborne as he is involved in a crash with Ryan Truex (83), Paul Menard (27), and Dave Blaney (77) during practice for Sunday's NASCAR Daytona 500 Sprint Cup Series auto race at Daytona International Speedway, Wednesday, Feb. 19, 2014. (AP Photo/News-Journal, Nigel Cook)