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

[Markus Semm]

Hi all,

Regarding an army of cell phones:

we can and are willing to provide approx.. 200 million records per year in real time with information how fast the traffic currently is at a given position in which direction at a given time.
80% of this data is from Germany.
In addition we can provide free of charge various Android software that allows recording and uploading the GPS based speed of a mobile object at a given position at a given time including heading information.

I´m sure there are other developers of apps / telematics companies as well that are willing to contribute such data.

Our lawyer checked from a legal point of view if there are any implications and confirmed, that the way we provide the data is fine regarding German privacy laws.

Cheers Markus




-----Ursprüngliche Nachricht-----
Von: Dennis Luxen [mailto:info at project-osrm.org] 
Gesendet: Montag, 24. März 2014 14:01
An: OSRM-talk at openstreetmap.org
Betreff: Re: [OSRM-talk] Huge difference in needed time computation OSRM / Google Maps

Hi,

> 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 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?

> Besides this huge time difference, one particularly 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.

-Dennis
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