Martin Koppenhoefer:
how would the data consumer know, where the lanes are? E.g. a lane to
turn left might also be right of the through-lanes, and this is crucial
for routers to give good indications.
Specially for data consumers and advanced mappers there is a section in
the proposal explaining step by step how to get the lane arrangement
from proposed tags:
http://wiki.openstreetmap.org/wiki/Proposed_features/Turn_Lanes#Building_lane_directions
Default positions for turn lanes (when no *:location is given; for
example, that lanes:turnleft are the leftmost lanes etc.) are explicitly
stated in the proposal.
IZ
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