As a mechanical designer, this “fantasy” stuff drives me batshit. I remember an award winning bike design based on room temp superconductor. There’s a similarly acclaimed and silly idea to put a bike and pedestrian bridge across the Hudson River from Jersey City to Lower Manhattan. Cost/benefit and other “externalities” like viewscape and river traffic are not considered in the least. The engineering is dubious, a cage frame structure spanning >500 ft between supports, according to this rendering.
