The complexity of jotting down a map

{{452223272}}This post at SvN turned on the light on a problem I had never thought about: public transport maps. I think the proposed solutions apply expecially to subway systems, in that accuracy of paths through the city can be left off in favour of more usable/readable maps.
It’s nice to see how in fact we are used to vertical/horizontal/45 degress mappings without this affecting our effort to decode the map.
Sometimes it’s nice to watch with new eyes everyday things.