For instance: I would love to see the correct symbol for roads on the
map--an Interstate shield, a US Highway shield, or a State Road shield
with the shape of the state. In a road relation, a URL to this is
stored in the symbol=* key. The renderer would just find all the road
relations a way is part of, grab their symbols, and place them on the
map.
Currently no renderer supports this.
I agree that this is in some ways easier to inspect and maintain.
Ironically, listening to a professional map maker describe their use of OSM
data, they won't touch route relations for use in placing highway shields
because they're *route relations*, not rendering hints.
Example 1: Un-joined ways (due to chunks of a road being part of
multiple imports, usually at county or state boundaries).
Currently, there are hundreds of thousands of these out there, lurking
unknown.
Frankly, they are already all known. The fix is simple - a manual
operation: just walk all county borders and stitch them together; the county
borders tell you where to go. This has already been done in many areas.
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