No spotters. Let the drivers figure it out on their own. They'd get manners immediately. Have a NASCAR official with Raceiver one way communication to all the drivers to alert them to any hazards on the tracks. Radio silence when the race is green otherwise. Let the driver talk to only the crew chief in the pits during the race. If they can run 150mph at Williams Grove with no radios or mirrors they can do it anywhere in a stock car.