Street network permeability

How permeable is a neighbourhood for walking or cycling? Builds the street network of a prepared city (or of an area within it) and returns the streets coloured by how much through movement they carry, plus indicators: intersection density, share of dead ends, mean segment length between intersections, street density and the detour factor (network distance compared with the straight line). Works on the cities prepared with the model "Prepare city data" (UMEP model server); run that first for a new city.