Being fortunate to live is a very rural location the quieter the better, but should be applied across the board including groups of ramblers with their walkie talkies.
I was a trail rider for years and it was always an issue with the dinky winky brigade who would want to ride with us, revving rodneys as well. Eventually packed in group riding as so many dickheads with loud pipes creating yet more alianation with a predominantly non biking poulation.