Kurt Busch was OK after crashing his car during Indianapolis 500 practice on Monday.
Busch is attempting to become the fourth driver and the first since 2001 to complete the NASCAR Coca Cola 600 and Indy 500 races the same day.
Busch crashed at Indianapolis Motor Speedway when he lost control of his car exiting Turn 2. He overcorrected his turn in the Andretti Autosport Honda, veered to the right and hit the outside wall. The car briefly flashed with fire as it spun to a stop in the infield grass.
Busch exited the damaged car on his own and was taken to the Speedway's Infield Care Center for a mandatory examination. Busch had completed 56 laps with his final one timed at 223.433 mph.
"One-hundred percent just working in traffic," the 2004 NASCAR Cup Series champion said, according to ESPN.com. "Just trying to settle in and not make mistakes and I just made a mistake.
"I was starting to feel comfortable. That's when I made the mistake of just letting my guard down or settling into that 'long run' type mentality, whereas with an Indy car you have to be on edge. You have to keep track of where you are at all times and the adjustments in the car. Maybe I just didn't keep up with keeping the car underneath me. You're trying to get into that rhythm and feel other things around you, and I got behind on my adjustments in the car."
Busch was checked and released from the care center within 15 minutes and cleared to drive. The car can be repaired in time for Carb Day, the final practice session before Sunday's race.
After the Indy 500, Busch plans to race in the Coca-Cola 600 later that day at Charlotte Motor Speedway.
"It's nice to (crash) at an opportune time," Busch said. "We still have Carb Day to shake things down and get back in the groove. This created a lot of work for the Andretti guys and I feel bad for that.
"As a rookie, there's things you learn and put it up on the edge and get away with, and then there's times when it will bite you. It's just tough."
Busch, 35, qualified for 12th Sunday for his first Indy 500 run at an average speed of 230.782 mph.
Tony Stewart was the last driver to complete both races the same day.