[OSM-talk] RFC: render explicitly used "oneway=no"

[Stanislav Brabec]

oneway=no is the default in most cases, so it is rarely needed tag.

But once it is mentioned explicitly, it should be rendered somehow, as
the mapper probably wants to emphasize this fact.

Proposal:
Use "<->" symbol wherever "oneway=no" is explicitly used.

Alternate proposal:
New tag "render_oneway=yes" or new value for "oneway=no:visible".


Example:
http://www.openstreetmap.org/?lat=50.07918&lon=14.41608&zoom=17&layers=0B0FTFT
Residential street Pstrossova consists of four segments (from up to
down):
<-
<->
->
<-

Without proper rendering of a bi-dir arrow in the second segment, one
will never guess, that the arrow from first and third arrow are invalid
for the second segment and the whole area would become an unsolvable
maze.

oneway=no would be typically used in two cases:

- One segment of one way street has traffic in both directions.

- Overwriting the default for some types of way or relation.

-- 
Stanislav Brabec
http://www.penguin.cz/~utx