In OSM complex turn restrictions using ‘from-via-to’ syntax can be modeled.
Graphhopper routing doesn’t consider such constructs.
We use Graphhopper for our GIS sollution. The pressure to deal correctly with the complex turn restrictions is increasing so I would like to discuss two points:
Is currently worked on this? There is an open issue (#446) but I cannot figure out if this is on the roadmap.
We probably need to decide if we put ressources in switching to OSRM or improving Graphhopper (the solution we would prefer) if this feature is not on your roadmap. Would you be interested in us (java developers) working on this feature? Would you be willing to accompany the development and support it with your know-how?
We would love to hear from you!