I've done 60% of the first check (in wpt editor) but there are still some odd data I already struggeled with when drafting the system based on 2016 data. For instance, there is a route (L3350) which was already tagged as L3350 on OSM 12 years ago and a press release of the road authority indicated it being L3350 a year ago, but the whole road is not visible on the map. There are more examples (L3003 Nieder-Eschbach, L3258 Dipperz,...) which "look odd" on the map...
I asked the road authority hessen.mobil for clarification. I stop the review and wait for an answer.