A professional who directs activities at automobile or motorcycle racetrack. Responsibilities include:

• Determines qualifying order of vehicles for each race based on trial event results or by drawing numbers.
• Assigns starters to position on track.
• Controls traffic to ensure only authorized number of vehicles are in pit.
• Directs vehicles to assigned places in pit.
• Ascertains legality of pit stops according to rules set by sanctioning body authorizing race.
• Consults with scorers to resolve scoring disputes.
• Determines penalties to be assessed for rules violation.
• May inspect vehicles and drivers for safety equipment, such as seat belts, harnesses, and helmets.