25 years ago, looking for a house for the fiance and I. Ended up buying a house by I-5 on the knowledge Caltrans was going to build a wall between my backyard and the freeway. They did. They took months to do it. Not kidding. Survey team came in, did their thing, then 2-3 months of nothing. Demo team came in to get rid of the existing brick wall, 3 days work, 3 months nothing. Peeps came in to dig holes, suckers were about 8 feet deep. I was worried my cat would fall in one so I had to buy 4-5 plywood sheets to put over the holes. Few months later people actually came in to build the wall. They dumped some iron things into the pool and didn't fish them out, left stains on my pool bottom. Within a year the paint covering started to blister. And the noise. Jeez, the noise.
Got divorced, moved to a quieter neighborhood. Whenever I visited the ex (yeah, she got the house) I couldn't believe the noise in the back yard. You couldn't carry a conversation at normal volume levels.
So, when the real estate dude and anyone else says "You'll get used to it", run. Run like hell. You'll get used to dealing with it, but you won't get used to it.
Ah yes, almost forgot. The "dust". The "dust" wasn't normal dust I've dealt with everywhere else I've lived. This "dust" was black soot-like nasty stuff.I'm guessing it was a combination of tire particles and brake particles, with a scattering of diesel stuff. Whatever, whenever I dusted I didn't get a light gray on my rag, I got a dark black.
Moral of the story? don't buy a house next to a freeway or, corollary, by a busy street.