Hi Bill-
The tracks that I know about that use sound limits have the limits monitored by SCCA. The SCCA rules have the sound measured at a set point around the track, 50 feet from the edge of the track. They typically pick a spot where cars are at near full throttle when they go by. IIRC the limit at Roebling Road in Savannah is 103 dB. Others vary, and I don't remember them enough to quote a number.
JDK
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Build LogQuinn the Slotus:Ford 302 Powered, Mallock-Inspired, Tube Frame, Hillclimb Special "Gonzo and friends: Last night must have been quite a night. Camelot moments, mechanical marvels, Rustoleum launches, flying squirrels, fru-fru tea cuppers, V8 envy, Ensure catch cans -- and it wasn't even a full moon." -- SeattleTom