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.<br><div class="gmail_quote"><div dir="ltr">On Sat, Dec 8, 2018 at 7:28 PM Warin <<a href="mailto:61sundowner@gmail.com">61sundowner@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div class="m_-346167747157121309moz-cite-prefix">On 08/12/18 20:25, ??? ?????? ?????
????????-????? Dar Alathar-Yemen wrote:<br>
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<blockquote type="cite">
<div class="m_-346167747157121309WordSection1">
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">Many
waterways (wadis) in our region used as roads when no rain
days.</p>
<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">How
to tag them? is it allowed to use (waterway + highway) in same
way?</p>
<p class="MsoNormal" dir="RTL"><span dir="LTR"><u></u> <u></u></span></p>
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<p><br>
</p>
<p><tt>Similar problems in Australia</tt></p>
<p><tt><br>
</tt><tt>Many ephemeral rivers are used for vehicles and some are
used as hiking paths.</tt></p>
<p><tt><br>
</tt><tt>For the hiking paths as these are routes I have simply
made them into members of the route. <br>
</tt></p>
<p><tt><br>
</tt></p>
<p><tt>Tagging both as highway + waterway will lead to problems. <br>
</tt></p>
<p><tt><br>
</tt></p>
<p><tt>Using the route relation has worked for the hiking trails
that I have done so far. <br>
</tt></p>
<p><tt>That migh</tt><tt><tt>t work for highways too, make a
relation with the normal highways and waterways as a route. <br>
</tt></tt></p>
<p><tt><tt><br>
</tt></tt></p>
<p><tt><tt><br>
</tt></tt></p>
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</blockquote></div>