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EL CAJON, Calif. (AP) -- Ready to thrill a few hundred school kids, Jimmie Johnson hopped into a replica of his No. 48 car to fire up the engine.

DAYTONA BEACH, Fla. -- After months of excitedly showing off artist renderings and offering architectural explanations, Daytona International Speedway announced Tuesday it's ready to break ground on the track's historical redevelopment project.

As the only driver pulling double duty across half the country this weekend, Brian Vickers is well aware of the special challenges ahead. Still, he's more aware of some challenges than others. 

If the same situation arose again, Greg Biffle would handle it the same way he did Sunday at Michigan International Speedway. In his view, there's simply no other alternative.

NASCAR driver Mike Harmon answered arrest warrants Monday, turning himself in to authorities in Shelby, N.C.