[Aachen]

Re-reading my comment, I see how this can come across. I'm actually fully in favor of having these speakers. Even if they would be annoying, then we should just switch to mainly using public transport especially in areas where people live or want to enjoy the outdoors. But yeah presumably it's just a low volume, enough for the person behind the car to realize it's on and rolling but not carry further. I haven't heard one myself yet.