[Tagging] Use of oneway=yes on waterways

Colin Smale colin.smale at xs4all.nl
Sat Sep 17 12:45:04 UTC 2016

I would expect that the situation where the flow direction conflicts
with the traffic direction is likely to be quite short - under bridges,
around obstacles etc. In these cases we could always call on our old
friend "oneway=-1" or "oneway=reverse" to mean "traffic direction is
opposite to the flow direction". Having to create a route relation is a
bit of a sledgehammer to crack a nut.


On 2016-09-17 14:35, Dave F wrote:

> I've seen it used on navigable canals to indicate traffic direction. 
> If there is a route relation I think it should be indicate with forward/backward roles.
> If not then for clarity, maybe something like traffic_flow=backwards?
> Adding a route relation would be preferable though.
> Dave F. 
> On 17/09/2016 13:20, Andy Townsend wrote: 
> 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). 
> Cheers, 
> Andy 
> FROM: LeTopographeFou 
> SENT: Saturday, 17 September 2016 13:17 
> TO: tagging at openstreetmap.org 
> REPLY TO: Tag discussion, strategy and related tools 
> SUBJECT: [Tagging] Use of oneway=yes on waterways 
> Hi 
> 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... 
> Yours, 
> -- 
> LeTopographeFou
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