Instead of this "messy map"... I don't think it is so difficult. It is hard because of all the amount of information you need to describe correctly but it is "easy". OSM can work with a 3D system, with in layers. Also you have the incline tag,ele, exit_to, ref, ref:colour, destination: , turn:lanes ... forward, backward, sides (relative to the way is drawn) Are you sure OSM is missing some tag? Can you create other one?
For example, in Spain we can use: destination:symbol distance turn:destination destination:ref destination:ref_int colour:ref colour:ref_int distance ref lanes arrow colour:arrow colour:text name motorway_junction exit_to direction side forward backward ... (other value variables, other key variables...) I'm sure I'm missing some value or interesting key. Do you need some more? yopaseopor
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