<div dir="ltr">If you want to use the data for non-routing questions I'm sure specificity can help. Like, imagine I want to estimate road maintenance costs by latitude or something of that shape.<div><br></div><div>Matt</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jan 25, 2023 at 10:28 AM Eric H. Christensen via Talk-us <<a href="mailto:talk-us@openstreetmap.org">talk-us@openstreetmap.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">------- Original Message -------<br>
On Wednesday, January 25th, 2023 at 11:35, Joseph Eisenberg <<a href="mailto:joseph.eisenberg@gmail.com" target="_blank">joseph.eisenberg@gmail.com</a>> wrote:<br>
<br>
<br>
> Why do we need surface=asphalt vs surface=concrete for highway=motorway?<br>
> <br>
> Does this make a significant difference for any users?<br>
> <br>
> I can certainly see the value of adding unpaved surface values for other classes of roads, but all motorways in the USA (and likely worldwide) will be paved<br>
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I can see that being an assumption but unless you verify that to be true you can't just summarily add that kind of data to the set. <br>
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Does it make a difference? I'm not sure. There are definitely friction coefficient differences between the two surfaces and I'd be willing to bet that one would be more efficient to travel across than the other. Perhaps routing engines could use this information to provide an even better, more efficient route. Of course, that is just an idea.<br>
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R,<br>
Eric <br>
<br>
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