[GraphHopper] VERY suboptimal route with via

[Jan Soelter]

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Hi,

>
> Hi,
> i was playing with graphhopper results and came past this:
>
>
https://graphhopper.com/maps/?point=Neuenkirchener%20Stra%C3%9Fe%2097%2C%2033332%2C%20G%C3%BCtersloh%2C%20Deutschland&point=Forsthaus%20Lohoff%2C%2033378%2C%20Rheda-Wiedenbr%C3%BCck%2C%20Deutschland&point=51.900223%2C8.368964&vehicle=foot&locale=de-de&elevation=true&layer=Lyrk

For me the route seems reasonable. Which way would you expect?

>
> I could not find any explanation of the route. I discovered while
> playing with my route home where i couldnt explain this:
>
>
https://graphhopper.com/maps/?point=Neuenkirchener%20Stra%C3%9Fe%2097%2C%2033332%2C%20G%C3%BCtersloh%2C%20Deutschland&point=Forsthaus%20Lohoff%2C%2033378%2C%20Rheda-Wiedenbr%C3%BCck%2C%20Deutschland&point=51.900237%2C8.369672&locale=de-de&layer=Lyrk
>
>
https://graphhopper.com/maps/?point=Neuenkirchener%20Stra%C3%9Fe%2097%2C%2033332%2C%20G%C3%BCtersloh%2C%20Deutschland&point=Forsthaus%20Lohoff%2C%2033378%2C%20Rheda-Wiedenbr%C3%BCck%2C%20Deutschland&point=51.900263%2C8.370059&locale=de-de&layer=Lyrk
>
> The via point moves 20m and the route changes drastically but it wont
> use the most obvious solution. I checked the data for an unconnected
> route but there is nothing. It seems graphhopper split a way in
> halve and didnt reconnect it in the resulting graph.
I think the route changes drastically, because it's the point at which
going the faster main road becomes faster than going on the smaller streets.
What do you think is the most obvious solution?

Cheers,
Jan
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