[GraphHopper] Which tags influence the routing?

[graphhopper]

Hello Lukas,

> Thanks for the very fast response!
>
>     > (and so useful that it makes sense to add them to OSM).
>
>     What do you mean here?
>
>
> It's just that I was wondering which of these tags is worth to do all
> the work to add it to OSM when I map streets -- and which isn't so
> important because it doesn't influence the routing.

Ah, ok I see. So let me reformulate my answer a bit to make it more
clear for other mappers as well.

I think the most important thing is to add addresses especially in
countries != Germany! Of course this has nothing to do with routing but
we really need address search like pelias or photon/nominatim for routing.

Besides addresses, I think indeed turn restrictions and truck
limitations are the information which often absent. (But both of them
are currently not taken into account from GH but will be this year
probably.) Maxspeed is another candidate and last but not least there
are many problems with oneways. I think they cannot be blind alleys but
often they are. See the last discussion about 'not found' or this here:
http://graphhopper-read-only-archive.1087335.n5.nabble.com/Issues-detecting-driving-paths-along-one-way-streets-td1002.html#a1003

I can easily create a script for this issue to find out all nodes and
ways with this problems world wide, if there is interest.

Regards,
Peter.
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