Street noise in attic apartment / penthouse

Hello everyone,
we are looking at a very spacious attic apartment/penthouse on the 3rd floor of a multi-family house, which we can almost completely design ourselves thanks to the early project stage. However, we have a problem where we hopefully can rely on your extensive experience: The building is located directly on a busy village street. The architect does not consider this a problem, for the following reasons:

[*]As part of the renovation of the nearby village square, the street will be resurfaced with a noise-reducing coating. This should absorb most of the rolling noise.
[*]The street will be downgraded from a cantonal road to a municipal road and converted into a 30 km/h zone.
[*]He further argues with the sound cone. Since the house is so close to the street, the sound of the cars goes straight up to the sky. We practically only hear something when we lean over the railing.

In theory, these are all good arguments. But does anyone of you have concrete experience with such a situation? We are worried that we will be dining or lying on this spacious terrace and constantly be surrounded by street noise. Of course, you will hear a motorcycle, but how about the regular traffic?

Thanks a lot for your help! Regards, Stefan

I am initially skeptical about residential areas and "whisper surfaces." Most pavements reduce the rolling noise, and at 30 km/h that is no longer decisive... I would have to look into the details, but reducing the speed and the number of cars is probably the better argument (so 2.)).

Whoever lives at the Kirchplatz hears the bells more quietly than those further away... if there is a taller house opposite you, the sound could be reflected to you, otherwise I see fewer concerns. You also get used to it, e.g., with railway facilities.

If you are sensitive or react sensitively to noise: find something else. Otherwise, go ahead.

You ask an expert, who hopefully is not the seller, and want to question their expertise?

Strange.

In my opinion, the best noise reduction takes place in the head.

Otherwise, the 30 km/h zone brings the best result.

We used to live in a 3-story ground floor apartment of a multi-family house, which had a great penthouse apartment on top, exactly as you describe it. 30 km/h zone and noise-reducing pavement. During the 5 years we lived there, the apartment was sold twice because the residents were stressed due to the street noise. It wasn’t bad down at our level, but the higher you went, the louder you could hear the street. If you are sensitive to noise, I would avoid it.

Rolling noise, and that is no longer relevant at 30 km/h...

Bold claim. Is there any proof for that?

As long as there is no intersection at the house where starting noises occur more frequently, you should have a significant improvement with a speed of 30 instead of 50. The idea that the sound energy in upper floors of houses directly on the street is lower makes some sense, but I cannot assess how strong the effect is. Have you already experienced the noise level on site?

Bold claim. Is there any evidence for that?

Rolling noises increase disproportionately with speed. At 30, they are so low that the effect of different smooth surfaces is no longer as significant. No evidence is needed for that; it is simple physics.