Fortunately, the concern gets a little smaller every day
:D :D :D .....Aha....so just wait a few more days, eventually it will be where it belongs. A justified feeling, but not a big bang.
I would first find my very own floor plan anyway, which can already be difficult enough. The roof shape usually results afterwards from a mix of development plan, taste, costs, etc. In my opinion, you can build a great house with any roof shape; the most important things happen INSIDE the house. Some things look great from the outside but don’t fit inside, so I would put that aside for now. I can’t imagine any roof shape helping you with the honking; many aspects can ultimately play a role.
If you *want* to "hear" it or are focused on it, you hear it anyway. If the concern is really persistent for you, I wouldn’t buy the building plot.
When planning, you can always keep that in mind and consider individual things that you might have done anyway or similarly. What I wanted to express more is that you can spend endlessly many euros on soundproofing, but with the window open or if you are focused on it you still hear it. The screaming neighbor or the humming heat pump are heard eventually, even if they do nothing and values alone are not enough since your perception is individual.
When my mother used to tiptoe upstairs at night, that was a nice feeling; later, during a lethal injection, I sometimes wanted to bite the windowsill—at exactly the same sound!
I think it will settle down for you :D
Do you mean an architect or something even more specific?
So if that would actually be my big, individual "problem"—and only then—I would want to educate myself accordingly, since it’s not really the architect’s specialty. There are various institutes and organizations on these topics and certainly experts who can say something proper about it. Searching, talking, reading might also change your feeling about it. You can do the usual and manageable measures anyway to adequately consider soundproofing. Then you see the price and can decide.