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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'NokiaPureTextLight';">Hi</span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'NokiaPureTextLight';">I have been having a play with your route and am wondering if the lack of speed limits tags on part of Redbanks Road is part of the problem?</span></p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'NokiaPureTextLight';"><br></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'NokiaPureTextLight';">Also 60% for unpaved roads seems way too high, I would expect something more like walking pace unless you are driving a rally car.</span></p>
<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'NokiaPureTextLight';"><br></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'NokiaPureTextLight';">Phil (trigpoint) </span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'NokiaPureTextLight';"> </span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'NokiaPureTextLight';">--</span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'NokiaPureTextLight';"> </span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'NokiaPureTextLight';">Sent from my Nokia N9</span></p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;"><span style=" font-family:'NokiaPureTextLight';"> </span></p></div><br><div id="fenix-reply-header"><p>On 17/04/2013 8:07 Samuel Longiaru wrote:<br></p></div><div id="fenix-quoted-body"><div>
Hello Everyone,<br>
<br>
</div>
<div>
New to the list, having only discovered your project yesterday. Looks<br>
like a great effort. Congratulations. So being new, I'm a little<br>
reluctant to barge in. But I have been a long-term contributor to OSM<br>
and being recently transplanted from Canada to Australia, am <br>
curious about some rather bizarre routing that pops up on your demo<br>
website for this part of the world. So I started looking into it.<br>
<br>
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<div>
<a href="http://osrm.at/2Vl">http://osrm.at/2Vl</a> shows a good example of what I'm talking about.<br>
While routing along the the M20 from Adelaide towards the Roseworthy<br>
Campus, the route leaves the M20 and continues on dirt roads. I think<br>
most would agree that continuing along the M20 to the next exit and<br>
following the paved Redbanks Road would be the more logical routing<br>
choice. This is only one example I've found of where dirt roads are<br>
suggested over much more logical choices.<br>
<br>
</div>
<div>
I've looked into the archives of this list as far back as I can go<br>
(only to January unfortunately) and didn't see these kinds of routing<br>
issues discussed. But I did find a feature request discussed in #389 and<br>
#497 on GitHub. In that discussion, there was a request for a default<br>
speed penalty of 0.6 for unpaved roads. From what I could gather, the<br>
issue was closed stating that while a penalty for bicycles might be<br>
appropriate, such a penalty was probably not appropriate for cars.<br>
<br>
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In South Australia the default statutory speed limit on rural roads<br>
(paved or unpaved) is 100 kph, and some mappers have included the<br>
maxspeed=100 tag. That's correct... but crazy. I haven't checked, but<br>
some of those unpaved roads may in fact be "access=dry_weather" only,<br>
turning to red gumbo in the rainy season. Speed=0.<br>
<br>
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I'm sure that in many places, the assumption that the travelling speed<br>
on unpaved roads is only 0.6 of the statutory limit is quite<br>
reasonable. If not that, then the "desirability factor" of driving on<br>
unpaved over paved may be 0.6. :) If my faint understanding of the<br>
project is correct, such speed rules can be set up in a customized<br>
LUA(?) and so may be resolvable. But I guess my point is, in the demo<br>
site, such adjustments should probably be made already. If the demo,<br>
set up for "Car (fastest)", routes off of M-roads and onto dirt, the<br>
routing engine has the "appearance" of not working correctly. I think<br>
the demo site should be adjusted to downgrade dirt roads at least, to<br>
better showcase the power and abilities of your project. The ultimate<br>
check of a routing engine is whether it gives results that are<br>
expected in a familiar area. In many cases around here, I'm left going<br>
"whuh?"<br>
<br>
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<div>
Anyway, like I said, a fantastic effort. Something I definitely want<br>
to learn more about.<br>
<br>
</div>
<div>
Thanks,<br>
<br>
</div>
<div>
Samuel Longiaru<br>
Kamloops, BC... temporarily in South Australia <br>
<br>
<br>
_______________________________________________<br>
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<div>
OSRM-talk mailing list<br>
</div>
<div>
<a href="mailto:OSRM-talk@openstreetmap.org">OSRM-talk@openstreetmap.org</a><br>
<a href="http://osrm.at/2Vl">http://osrm.at/2Vl</a><br>
<br>
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