> I reckon a single loud motorcycle could disturb tens of thousands of people, potentially waking or startling them, raising blood pressure etc. in a single 10 minute trip.

What absolutely grinds my gears is when a loud motorcycle or sports car drives through my residential neighborhood right after patiently rocking my baby to sleep.

Interestingly, as a motorcycle and sports car owner myself, I never thought about that aspect for even a second until I became a dad—I drive much more gently nowadays (especially in residential neighborhoods)!