Half of the drivers say something like: "well, go live in the forest then". I find it incredible that silence is ignored these days and that a noisy city is becoming the norm; it's a shame: it makes us more stressed and less relaxed.
The majority of noises could be suppressed: honkings, old train brakes, motorbikes without an exhaust, …, but people don't really seem to care (but I'm sure it impacts everybody).