The B44 is almost a motorway: 2 lanes in ech direction. Speed limit 100km/h. It has ins and out like on a highway, so it is highly dangerous for road cycling. Komoot offers this road as the best an most popular road bike option between Langener Waldsee and Frankfurt; however, I believe this is only the case because this road is part of the Ironman Frankfurt when thousands of athletes use this road. At this time it is exclusively to cyclist. During the rest of the year this road should be marked as highly dangerous for cyclists. It is not suitable at all.