I'm all for thinking out of the box but this elevated pedal system would be brought to a grinding halt if someone decided to stop and hold up traffic, or if a pedal car broke down and got stuck...
so cities will only have to find hundreds of millions of dollars to build this over existing routes, and then convince riders to squeeze their fat asses into a claustrophobic little box, permeated by the sweat-stench of so many previous riders. this idea sounds perfect.