NASCAR has revamped its overtime procedure, moving to an unlimited green-white-checkered finish and establishing an "overtime line" to determine the race winner.

The arbitrary OT line will vary by track. If the race leader passes the overtime line on the first lap under green before a caution comes out, it will be considered a valid green-white-checkered attempt. If a caution comes out before the leader passes the overtime line on the first lap under green, it will not be a valid attempt. The race will continue until there is valid attempt.

NASCAR previously had a limit of three tries to complete the race.

NASCAR also has reduced the Sprint Cup field to 40 drivers from 43 because of its new charter model that guarantees a spot in the field.