[Tagging] Mapping bicycle-only turn lanes

[Minh Nguyen]

Vào lúc 14:08 2020-12-08, Mateusz Konieczny via Tagging đã viết:
> Mapper in Poland run into a tricky case and asked for help.
> 
> I am forwarding this a bit weird case.
> 
> Photo is at
> https://commons.wikimedia.org/wiki/File:Krak%C3%B3w_Brodzi%C5%84skiego_(5).jpg 
> <https://commons.wikimedia.org/wiki/File:Krak%C3%B3w_Brodzi%C5%84skiego_(5).jpg>
> and depicts
> 
> - contraflow bicycle lane
> - bicycle-only left turn lane (signed left turn)
> - general purpose lane (unsigned turn)
> 
> How this should be tagged?
> 
> Following is my idea but...
> 
> highway, name, lit=yes, surface=asphalt etc
> oneway=yes
> oneway:biycle=no
> lanes=1 (as bicycle lanes are not counted)
> vehicle:lanes:forward=no|yes
> bicycle:lanes:forward=designated|yes
> turn:bicycle:lanes:forward=left|
> turn:lanes:forward=|
> vehicle:lanes:backward=no
> bicycle:lanes:backward=designated



> cycleway:left=lane
> cycleway:right=???? - there is left turn lane only, so 
> cycleway:right=lane would be
> not entirely correct but there is a left turn lane, cycleway:right would 
> be worse....

I've always understood the cycleway:left/right=lane to refer to the 
presence of a bike lane on one side of the physical roadway or the 
other, regardless of the direction that lane travels. After all, the 
keys aren't cycleway:forward/backward. For example, in a country that 
drives on the right, a contraflow bike lane on the right side of the 
roadway would be tagged cycleway:right=opposite_lane, not 
cycleway:left=lane.

A *:lanes key might be one way to clarify the layout of that part of the 
road: cycleway:left=lane cycleway:left:lanes=2. But note that the turn 
lane tagging you suggested above is distinct from the considerations 
around cycleway:*; your suggested tagging for turn lanes seems 
reasonable to me.

[1] https://taginfo.openstreetmap.org/keys/cycleway%3Aright%3Alanes

-- 
minh at nguyen.cincinnati.oh.us