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<div class="moz-cite-prefix">On 23/09/2019 09:14, Volker Schmidt
wrote:<br>
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<div>every mapper can set his own, as you doe and I
do, but this means that a router has to second
guess what people think is standard use in
different countries.<br>
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<div>That is exactly how it works.<br>
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<div>In general, tagging surface is almost <br>
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<div>always good idea or at least nice to do.</div>
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<div>But this very unsatisfactory for routing. Two examples:</div>
<div>If I hire a rental car in the US, the contract ays, that
I cannot use unpaved roads.</div>
<div>If I use bicycle anywhere I would like to be able to
instruct my router to avoid unpaved roads.</div>
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<p>Ultimately, where information is missing, you as a data consumer
will need to make a decision about whether or not a road is likely
to be paved or not. <br>
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<p>Adding a default (even per-country) won't magically make all
non-surface-tagged roads paved or unpaved, and where data has come
from import (e.g. TIGER in the US) or imagery (e.g. many places in
Africa, Australia, etc.*) it isn't always possible to tell what
the surface is when first adding to OSM.</p>
<p>Best Regards,</p>
<p>Andy</p>
<p>* and also some areas in the UK, where data was taken from OS
OpenData before imagery/surveys were available -
<a class="moz-txt-link-freetext" href="https://www.openstreetmap.org/#map=15/53.8724/-1.1287">https://www.openstreetmap.org/#map=15/53.8724/-1.1287</a> being one
such example.<br>
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