I saw Tim's courses the other evening, and one of the 3D options (not sure which #) , I could not work out why an underpass was mapped thus.
I avoid urbans / sprints which are 3D. Maps & my O exp are 2D. Leeds JK 2016 sprint was dreadful - totally lost / clueless / wrong level.
Looking at the Stockholm indoor in the latest CompassSport, I see a sport that i have no desire to try... others think this is great fun .. each to their own.
There were two tunnels which looked the same on the ground from the lower level. One was mapped wholly with the grey underpass symbol. The other part grey underpass whilst the rest showed what was at the higher level 15m above. The reason simply that part of the higher level is accessible but not the rest. That's impossible to discern from the lower level.