This link gives details of current and planned road closures in the area: Oberursel Strassensperrungen (in German)
The stretch of road affected is from An der Waldlust up to the roundabout at the B455. Only one side of the road will be open, and the traffic will be controlled by traffic-lights. Drivers heading for An der Waldlust (FIS) from the A661/B455 are advised to avoid the Feldberg/Hohemark exit and approach from the town centre end, i.e. past Edeka.