The best noise reduction measure in cities is to limit cars to 30 km/h. Which, by the way, also actually reduces the time it takes to get to places by car (beca

The best noise reduction measure in cities is to limit cars to 30 km/h. Which, by the way, also actually reduces the time it takes to get to places by car (because you need fewer traffic lights), apart from obviously making the city much safer for bikes and pedestrians.