[Tagging] Feature Proposal - RFC - Turn Lanes

bkmap burkhard.kirchner at web.de
Tue Oct 18 06:44:41 BST 2011

Am 11.10.2011 13:29, schrieb Martin Koppenhoefer:
> 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.

When we already have numbers for the track positions, why we do not use 
them thus? So the data consumer knows the location without the 
lanes:location tag.


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