Enter the 3D Fast Bus, a futuristic concept vehicle that carries passengers above street level, straddling the lanes below so traffic can pass freely underneath.

Running on solar power gathered from its rooftop supplemented with grid energy, the "Fast Bus" is expected to top out just shy of 40 miles per hour, so it's not ideal for long treks.

To travel by bus is easy, cheap and convenient, though not so fast as travelling by plane or so comfortable as by train.