It's usually related to the track's proximity to other property. Track's on the east coast have it as well as up in Canada. 92dB is a pretty common limit, and many tracks will black flag you if you go over the limit. This is the east coast list that I have.
NHMS: 99 dB @ 50ft (never enforced to my knowledge)
Mont Tremblant: 92 dB
Mosport: No limit
Summit Point: 103dB @ 50ft
Lime Rock Park: 86-88dB @ 50ft (depending on club)
Calabogie: 92dB @ 50 ft
Watkins Glen: No limit
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