I has looking at a TV show about traffic violations including the odd
high speed chases.
Part of the show was about the technical integerty of vehicles being
pulled over.
One of the things the police looked at was the sound level of cars and
motorcycles, especially the ones with the sporty exhausts.

So things went like: Your VW golf is rated at 84db and it produces 106
so you get a fine of ... and show us your car in two weeks with the
original exhaust.
There was a bike that is allowed to produce 92db at 5000 rpm.

Hmmm, 84 and 92 db.
My noise certificate shows that my plane(1974 MS880B) produces 69db.
That is way below a standard car or bike is allowed.

Now my question is why people complain about light aircraft noise while
there are hordes of cars and bikes that make a lot more noise?

-Kees