I would love to support a tag that says real-world speed instead of maxspeed without expanding into time-dependent speeds. Tagging a dirt road with 100 max speed is a bit adventurous, I must say ;-)
--Dennis Am 17.04.2013 um 14:31 schrieb Philip Barnes <p...@trigpoint.me.uk>: > Hi > 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? > > Also 60% for unpaved roads seems way too high, I would expect something more > like walking pace unless you are driving a rally car. > > Phil (trigpoint) > > -- > > Sent from my Nokia N9 > > > On 17/04/2013 8:07 Samuel Longiaru wrote: > > Hello Everyone, > > New to the list, having only discovered your project yesterday. Looks > like a great effort. Congratulations. So being new, I'm a little > reluctant to barge in. But I have been a long-term contributor to OSM > and being recently transplanted from Canada to Australia, am > curious about some rather bizarre routing that pops up on your demo > website for this part of the world. So I started looking into it. > > http://osrm.at/2Vl shows a good example of what I'm talking about. > While routing along the the M20 from Adelaide towards the Roseworthy > Campus, the route leaves the M20 and continues on dirt roads. I think > most would agree that continuing along the M20 to the next exit and > following the paved Redbanks Road would be the more logical routing > choice. This is only one example I've found of where dirt roads are > suggested over much more logical choices. > > I've looked into the archives of this list as far back as I can go > (only to January unfortunately) and didn't see these kinds of routing > issues discussed. But I did find a feature request discussed in #389 and > #497 on GitHub. In that discussion, there was a request for a default > speed penalty of 0.6 for unpaved roads. From what I could gather, the > issue was closed stating that while a penalty for bicycles might be > appropriate, such a penalty was probably not appropriate for cars. > > In South Australia the default statutory speed limit on rural roads > (paved or unpaved) is 100 kph, and some mappers have included the > maxspeed=100 tag. That's correct... but crazy. I haven't checked, but > some of those unpaved roads may in fact be "access=dry_weather" only, > turning to red gumbo in the rainy season. Speed=0. > > I'm sure that in many places, the assumption that the travelling speed > on unpaved roads is only 0.6 of the statutory limit is quite > reasonable. If not that, then the "desirability factor" of driving on > unpaved over paved may be 0.6. :) If my faint understanding of the > project is correct, such speed rules can be set up in a customized > LUA(?) and so may be resolvable. But I guess my point is, in the demo > site, such adjustments should probably be made already. If the demo, > set up for "Car (fastest)", routes off of M-roads and onto dirt, the > routing engine has the "appearance" of not working correctly. I think > the demo site should be adjusted to downgrade dirt roads at least, to > better showcase the power and abilities of your project. The ultimate > check of a routing engine is whether it gives results that are > expected in a familiar area. In many cases around here, I'm left going > "whuh?" > > Anyway, like I said, a fantastic effort. Something I definitely want > to learn more about. > > Thanks, > > Samuel Longiaru > Kamloops, BC... temporarily in South Australia > > > _______________________________________________ > OSRM-talk mailing list > OSRM-talk@openstreetmap.org > http://osrm.at/2Vl > > > _______________________________________________ > OSRM-talk mailing list > OSRM-talk@openstreetmap.org > http://lists.openstreetmap.org/listinfo/osrm-talk
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