I've certainly used "_oneway_=yes" on inland waterways to document signed traffic flow control, so a blanket removal would make no sense.

There may be places where a previous mapper has tried to use it in error to indicate water flow direction, but you'd need to ask whoever the previous mapper was in each case (or use a bit of common sense).


From: LeTopographeFou
Sent: Saturday, 17 September 2016 13:17
To: tagging@openstreetmap.org
Reply To: Tag discussion, strategy and related tools
Subject: [Tagging] Use of _oneway_=yes on waterways


According to the waterway=stream wiki page (http://wiki.openstreetmap.org/wiki/Tag:waterway%3Dstream):

If a flow exists, the direction of the way must be downstream (i.e. the way direction follows the flow)

As of today there is a very small percentage of streams (17593 ways according to taginfo, 0.23%) with _oneway_=yes.

Is there any undocumented purpose? Is it ok and safe to delete _oneway_=yes tags for streams?

The same question can apply to drains, ditches, canals...



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