Our speed limits are actually similar for similar designed roads in urban areas, 50km, 70km, 80km and 100km. A lot of the road network is 100km national speed l

Our speed limits are actually similar for similar designed roads in urban areas, 50km, 70km, 80km and 100km. A lot of the road network is 100km national speed limit, and you wouldn't typically drive that fast on US roads of a similar design (single lane each way and quite often just a single lane for both directions!). But this is because NZ has a low population and pop density. While the US has some places with a low density, it can still afford to road up those areas "better" than NZ can.