Related Clues:

• Brickyard entry
• Daytona car
• Jockey, e.g.
• Taxi passenger
• Toy on a track
• Bill addendum
• Tour de France participant
• Marathon entrant
• One running on a track, maybe
• Hitchhiker
• Contract clause
• One making a pit stop, maybe
• Bus passenger
• Piece of pork?
• Indy auto