Daytona practice marred by multicar crash

If the first practice is any indication, Speedweeks could be filled with aggressive driving, big wrecks and backup cars. An on-track tangle between Mark Martin and Denny Hamlin triggered a seven-car accident Thursday that may set the tone for two weeks of ramped-up racing at Daytona International Speedway.

"Trust me, we're not finished," said Greg Biffle, who was involved in the wreck.

Jamie McMurray, Joey Logano, Kyle Busch and Clint Bowyer also were part of the melee, which happened halfway into the first practice for the Budweiser Shootout.

Martin was in front of Hamlin in a pack of cars when Hamlin hooked the rear of Martin's car. The contact turned Martin into the wall. Hamlin and Martin agreed that the wreck started because each driver anticipated the other doing something different.

"Ultimately, everyone's out there jockeying for position and everything to find out what their car can do," Hamlin said. "I mean, it's hairy out there for sure, and those things are going to happen whenever you're running that close and there's miscommunication, you're going to have guys running into each other."

Hamlin, Martin, Biffle, McMurray and Bowyer – driving in place of Kevin Harvick, who missed practice because of flulike symptoms – were forced into backup cars for the Saturday night exhibition race that kicks off Speedweeks.