[Tagging] Feature Proposal - RFC - Turn Lanes

Martin Koppenhoefer dieterdreist at gmail.com
Tue Oct 11 12:29:21 BST 2011


2011/10/11 Ilya Zverev <zverik at textual.ru>:
> Martin Koppenhoefer wrote:
> There was a proposal for tagging type of divider, but it has been abandoned
> for several years:
> http://wiki.openstreetmap.org/wiki/Proposed_features/Divider


There is also a proposal for a relation to unify dual carriageways
(e.g. often pedestrians can cross but cars can't, dependent on the
kind of divider) which also allows for tagging of the divider (either
implicitly or explicitly):

http://wiki.openstreetmap.org/wiki/Relations/Proposed/Area


>> How would you tag a lane according to this proposal that allows at the
>> same time e.g. to go straight and left?
>
> Lanes separately are not tagged, only lane groups. In this case there are
> one lane group for turning left and one — for going straight. So it would be
> lanes=N, lanes:turnleft=1, lanes:through=N. If the left lane was used _only_
> for turning left, lanes:through tag could be omitted.


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.

cheers,
Martin



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