It was only in October 2018 with the construction of the expressway "started". Until now (October 2018) is here field. "F17" announced that between Egelsbach and Erzhausen already a nice asphalted track was built. (December 2018).
On YouTube I have the finished route from Wixhausen to Egelsbach as a video set. Unfortunately Komoot does not work well here and does not play the video from the beginning. PLEASE RETURN! Those interested can look here: