Race driver Kurt Busch practices at the Indianapolis Motor Speedway during the Rookie Orientation Program in Indianapolis, Tuesday, April 29, 2014. Busch will try to be the first driver in a decade to compete in IndyCar's Indianapolis 500 and Sprint Cup's Coca-Cola 600 on the same day.

Michael Conroy / AP

Race driver Kurt Busch practices at the Indianapolis Motor Speedway during the Rookie Orientation Program in Indianapolis, Tuesday, April 29, 2014. Busch will try to be the first driver in a decade to compete in IndyCar's Indianapolis 500 and Sprint Cup's Coca-Cola 600 on the same day.