Perhaps the reduction could just be specified for each way type? I think it makes sense. The average might be to go at 85% of max speed on motorways, but only 70% of max speed at residential.
E -----Oprindelig meddelelse----- Fra: Rudolf Mayer [mailto:[email protected]] Sendt: 28. marts 2014 11:11 Til: [email protected] Emne: Re: [OSRM-talk] Huge difference in needed time computation OSRM / Google Maps Hi Emil! Thanks for pointing this out! Indeed the limit to 2/3 of the max speed seems a bit too conservative, that is, at least outside of cities; inside city limits you could argue that it is ok, at least as long as there is no turn penalties and traffic light penalties implemented; and you generally can always expect a bus or slow traffic.. :-) I am still wondering whether also the number of lanes is considered in the example. I think that other routers consider this, and if a road has more than 1 lane per direction, the speed reduction is less severe, or at least that road is preferred over other roads that are single lanes per direction. greetings rudi [Emil Tin], On 2014-03-28 09:33: > > > Hi, > The following issue might contribute to inflated travel time: > https://github.com/DennisOSRM/Project-OSRM/pull/969 > > > Emil Tin > City of Copenhagen > > > -----Oprindelig meddelelse----- > Fra: Rudolf Mayer [mailto:[email protected]] > Sendt: 24. marts 2014 13:30 > Til: [email protected] > Emne: [OSRM-talk] Huge difference in needed time computation OSRM / > Google Maps > > Hi everyone! > > I tried to compute the following route: > > http://osrm.at/?hl=en&loc=48.208845,16.372329&loc=48.276104,16.791565 > > And get this as a proposed result: > > Route Description > (B3 - L2) > Distance: 44.4 km > Duration: 1 h 15 min > > > 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... > > > I am not sure what this is caused by, the map data seems ok for this route. > > > 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? > > greetings > 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 > _______________________________________________ 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
