Berlin has no steep hills and provides numerous bicycle paths (Radwege) through the city (Whilst not all are really smooth). These contain 860 km of totally separate bicycle paths, 60 km of bike lanes on streets, 50 km of bicycle lanes on pavements or sidewalks, 100 km of mixed-use pedestrian-bicycle https://mylesyejot.thecomputerwiki.com/5089595/the_smart_trick_of_berlin_that_no_one_is_discussing