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Earnhardt will also end his streak of 461 consecutive starts, which is the fifth longest active streak in the Sprint Cup Series.

NASCAR strengthened its commitment to keeping drivers with concussions off the track in 2002, in part because Earnhardt admitted he was unable to fully concentrate or communicate with his crew chief after an accident at California. He self-diagnosed himself with a concussion, which he revealed weeks later.

NASCAR then said doctors at infield care centers could require drivers to undergo CT scans or MRIs if they suspected a concussion. Clearance to race after suffering a concussion is not given until after a driver obtains a medical release.

Nationwide Series driver Eric McClure missed six weeks this season with lingering effects of a concussion suffered at Talladega. McClure said the concussion he sustained in the May 5 race was the third of his career, one of the main reasons his doctors and NASCAR officials made him sit out for an extended period of time.

“There’s not really a set timetable for those things and that’s been the challenging thing,” McClure said after his June return. “That’s what kept me from coming back was the lingering symptoms. I really felt a couple of weeks ago, after the first two weeks of being away from the track, and having total brain rest, that I was ready. But (my doctor) felt like we needed to wait, and I respect that opinion.”