The lack of speed limits on the rural secondary roads will almost certainly be having an effect here.
If you are in the area, it would be a good idea to survey and tag the speed limits. I have found that correct speed limit tagging will often fix these problems. I find a dashcam/video camera mounted in the car helps, as it is difficult to remember exactly where the change of limits occurs. Phil (trigpoint) On Mon, 2014-03-24 at 14:34 +0100, Rudolf Mayer wrote: > Hi! > > [Dennis Luxen], On 2014-03-24 14:01: > >> http://osrm.at/?hl=en&loc=48.208845,16.372329&loc=48.276104,16.791565 > > > > ... > > > >> This seems very wrong, though, Google maps estimates > >> (http://goo.gl/maps/EPt14) > >> a.) a likely more optimal route, preferring bigger streets > >> b.) estimates 45,1 km, 47 Minutes. Almsot 30 mins difference in a 47 > >> minutes route seems way off… > > > > We do not have any real traffic info, especially no information on how long > > routes actually takes. Thus we have to make educated guesses. > > Unfortunately, these guesses may sometimes be off. If we just had an army > > of cell phones telling us their positions every other minute. ;-) > > > I understand that perfectly ;-) > > but the given difference just seemed way too much, as the OSRM route > takes >50% longer. > > >> I am not sure what this is caused by, the map data seems ok for this route. > > > > Did you spot any portions of the route that take obviously too long? > > > A better link than before, to be more comparable to google: > http://osrm.at/?hl=en&loc=48.209198,16.372941&loc=48.276104,16.791565 > > Now when I put that on my version of the interface at > http://kronos.ifs.tuwien.ac.at/osrm/main.html?hl=en&loc=48.209198,16.372941&loc=48.276104,16.791565 > > to get the segment details, the following estimates seem to take likely > too long: > > * Turn slight right onto L2 > 5.54 km (9 min | 35.5 km/h) > > * Turn right onto L2 > 7.81 km (13 min | 35 km/h > > These are secondary roads, partly in villages with 50km/h speed limit > (but not much traffic 90% of the time, as there are no traffic lights or > major intersections), but for the rest the limit would be 100km/h, and > occasionally 70km/h before crossings. thus the average of 35km/h seems > very much off, and I would rather expect double that speed. > > >> Besides this huge time difference, one particullarily interesting detail > >> in the routing is at http://osrm.at/6PV, where OSRM prefers a short cut > >> through a much smaller street (tertiary vs primary) that has much more > >> crossings, and http://osrm.at/6PW would be the much preferred rout.. > >> > >> Any ideas why this is happening? > > > > Both routes have a very similar estimated driving time with the „bad“ one > > just a bit faster. Turn penalties, ie. caring for turns and passed > > intersections is on the roadmap. > > > Do you consider the lane information as well? I see that on the priority > road this wasn't provided correctly everywhere, I fixed that now, maybe > it will change after the next update. > > thanks, > rudi > > _______________________________________________ > OSRM-talk mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/osrm-talk _______________________________________________ OSRM-talk mailing list [email protected] https://lists.openstreetmap.org/listinfo/osrm-talk
