[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.
//colin
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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