I think it’s a legal requirement, because it’s the same for Tesla.
I'm guessing though that you're in the EU (I'm in the US where it is almost considered criminal to go speed limit on the highway)
The way to get to the city proper goes through country roads that probably used to only get a few dozen vehicles per hour, now having to handle massive traffic due to the new developments in this area (they're still building!)
They're working on reworking the roads but the speed limits are nonsensical because of this history.
I do wish it was even quieter tho. It's kinda of a shame you got a quiet EV but then add annoying bingbongs.