According to the paperwork I have : Max sound (static) 104 dba. ON FRIDAY 88DBA MAX (dynamic ) whatever that means. Non compliance will result in exclusion without a refund!
Aparently the trick is to suss out where the mic's are and if you go past with a few other bikes around you then you can nail it, but if you're on your own then back off as you pass the mic's.... ta daaa!