@pezmico @runoutgroover narrow roads cause the drivers to drive slower automatically, while wide open roads cause them to speed up, regardless of the speed limit. I think in Japan the narrowness is often due to the limited amount of space where you can build houses, but it works. In the city I live in (in Germany) they've reconstructed and purposefully narrowed down some big arteries in the last few years, and it's much more comfortable for people now.