It varies from track to track, the bigger tracks can be 55-65 mph, short tracks may only be 35 mph. Years ago when the Craftsman Truck Series raced at Colorado National Speedway, a 3/8 mile track, I got to watch the drivers meeting (back then the pits were open to everybody and they had the meeting in an open air tent) and the race director was telling the drivers that pacecar speed that day was 25 mph.
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