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.
