Let’s consider a standard car park, just one of the usually seen in every city. Let’s take into account conventional bikes instead of monster or folding bikes. Sum up inverted U bike racks. And finally, let’s think about putting them perpendicular to the direction a car is parked. As a result of all them, the impressive figure of ten bicycles can be parked in the same surface one car needs to be parked, not considering a two or three floors bike rack, and do considering there is enough space to park and lock each bicycle. If you add a nice, colorful frame, you get this picture: