Kurt Busch was fined $50,000 by NASCAR on Tuesday for reckless driving on pit road at Darlington and a post-race altercation with Ryan Newman’s crew members.

Busch was also placed on probation through July 25 for his actions Saturday night, which began when a flat tire caused him to wreck with six laps remaining in the race.

He headed to pit road for repairs, and as he left, he did a burnout through Newman’s pit box. There were crew members over the wall and on pit road at the time, and they complained they could have been injured by Busch’s actions.