[OSRM-talk] Huge difference in needed time computation OSRM / Google Maps

[Emil Tin]

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.mayer at gmail.com] 
Sendt: 24. marts 2014 13:30
Til: OSRM-talk at 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

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