How to introduce turn costs

Hi there,
I currently have Graphhopper working great with turn costs, but in certain cases the route calculation doesn’t take account turn costs, I guess it’s due to missing map data, so how can I introduce turn costs to a map?

Thanks in advance…


this question seems to be more OSM related than GraphHopper related :).

You can use this overpass query to find turn restrictions. More about turn restrictions and how to tag them can be found here.