Hi,
During my last travel in Africa, I was thinking on how to map
obstacles on road. So I support your proposal but in a generalized
way, not only for pedestrian or bicycle. And I take the opportunity to
review what I observed:
- a narrow bridge i.e. you can't cross a vehicle in opposite
direction. We may use width=* but it is difficult to get it precisely.
obstacle=narrowness
- a bridge or a raft with a bad link to the road/track i.e. a step at
each end of the bridge/raft. obstacle=unevenness ? or obstacle=step?
For me unevenness is to soft for what you describe.
- a hole in the road.
* A small hole you can drive other at full speed but that may
surprise you when driving during night.
* A medium hole where you have to use the other side of the road at
full speed if nobody is arriving in front
* A big hole where you have to slow down and drive inside.
(For full uneven sections, I use smoothness=*).
- a road on a dam or a bridge have been damaged : a bailey bridge
(http://en.wikipedia.org/wiki/Bailey_bridge) have been temporary (for
ten years ;-) ) added on it.
I would no use obstacle for thinks that are deliberate and/or in their
initial state.
For river and water. If there is water year around (or large fraction
of the year) : ford=yes. Only flooded few days a year (after heavy
rain), flood_prone=yes. Use surface=* to indicate whenever you are
just driving in the river or if there is some raft build. Seasonal?
Use seasonal=yes in conjunction with access:conditional=* to indicate
approximative closing period (discussed recently on this mailing list.
I will update the wiki according soon...).
Same with traffic_calming, check points...
HOT is also dealing with obstacle :
http://wiki.openstreetmap.org/wiki/Humanitarian_OSM_Tags/Humanitarian_Data_Model#Obstacle
Eric
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