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:rudolf.ma...@gmail.com] Sendt: 24. marts 2014 13:30 Til: OSRM-talk@openstreetmap.org 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 OSRM-talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/osrm-talk _______________________________________________ OSRM-talk mailing list OSRM-talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/osrm-talk
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