[Tagging] Use of oneway=yes on waterways

[Dave F]

Clarification: I'm meant a route relation for the whole canal, not just 
to define travel direction.

On 17/09/2016 13:45, Colin Smale wrote:
>
> 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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>>
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