I live in town, and although it's a very small town (600 people) it can still get pretty doggone noisy! We have the mosquito spraying truck once a week or so in summer, and that thing is noisy as all get out. Then once a month they send a plane spraying for mosquitoes out at 5 am, flying very low like a crop duster right over the houses. Wakes the whole town up! Several of the folks in town are truck drivers, so we have the 18 wheelers coming home down our street.
The most reaction we get is a look up, then it's back to what they were doing. We have an Easter Egger hen, Dumb Daphne the Flock Complainer, and she is always on full alert. She looks at the louder-than-heck garbage truck then goes back to whatever....no stress, no problem. Let someone pull up in front and get out of their car, however, and she watches every move they make from they open the gate until the time they get back in their car and leave! They get used to all sorts of racket, and they do it very quickly.
And welcome to BYC! Glad to have you!