[Tagging] How to tag shared waterway highway

[Warin]

On 08/12/18 21:31, Joseph Eisenberg wrote:
> I would recommend drawing a separate “way” for the highway. I imagine 
> that the route taken by vehicles or people walking is a few meters off 
> of the center of the waterway, and perhaps a little straighter. If you 
> are coarsest tracing the waterway and road, then the two ways might 
> share most of their nodes.

I don't think you have used them. The ones I have used:
The waterway will vary from one flow to the next by some meters - they 
are sand bottoms. The rivers when flowing are 10s of metres wide.
Some flood in flatter areas.
The road/track will change after a rain event by meters to make best use 
of the changed topography.
The are mostly sandy bottoms - meters wide. Take a look at the Todd River in
https://wiki.openstreetmap.org/wiki/Proposed_features/ephemeral#Examples

The way shown in OSM (or any map) is a guide.
I would not take the trouble to offset one from the other, if it were 
done then it is bound to be on the wrong side :)

> On Sat, Dec 8, 2018 at 7:28 PM Warin <61sundowner at gmail.com 
> <mailto:61sundowner at gmail.com>> wrote:
>
>     On 08/12/18 20:25, ??? ?????? ????? ????????-????? Dar
>     Alathar-Yemen wrote:
>>
>>     Many waterways (wadis) in our region used as roads when no rain days.
>>
>>     How to tag them? is it allowed to use (waterway + highway) in
>>     same way?
>>
>
>     Similar problems in Australia
>
>
>     Many ephemeral rivers are used for vehicles and some are used as
>     hiking paths.
>
>
>     For the hiking paths as these are routes I have simply made them
>     into members of the route.
>
>
>     Tagging both as highway + waterway will lead to problems.
>
>
>     Using the route relation has worked for the hiking trails that I
>     have done so far.
>
>     That might work for highways too, make a relation with the normal
>     highways and waterways as a route.
>
>
>
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