Correctly tagging turn-restrictions without a sign

Hey there, Could anybody tell me how to tag restrictions as seen here? osm.org/?lat=47.653834&lon=9.483013&zoom=18&layers=M Just guess ...

Correctly tagging turn-restrictions without a sign

Hey there, Could anybody tell me how to tag restrictions as seen here? osm.org/?lat=47.653834&lon=9.483013&zoom=18&layers=M Just guess ...