I tried to make a map with an extra style for dual carriageways for each
of highway=primary, secondary, and tertiary. The problem is that I do
not see an appropriate tag to search for. Dual carriageways are
characterized by two roughly parallel ways with oneway=yes. It is not
necessary that they are tagged with highway=trunk.
highway=tertiary & oneway=yes {set highway=tertiary_dual;}
often does the trick, but it changes also some other roads.
Do you have some better suggestions?
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