Most of Amsterdam is 30 km, including through roads. But it's Amsterdam through roads, so it's mostly two lines one way, a dedicated tram track in between, tree

Most of Amsterdam is 30 km, including through roads. But it's Amsterdam through roads, so it's mostly two lines one way, a dedicated tram track in between, trees that separate the road from a bike path and all that. Actual in-district roads where unsupervised 8 year olds are cycling to school and back are 15 km/h.