Bizarre car-spotting - Autobahn by Kraftwerk

I was watching a live performance cut of Autobahn, when I spotted something very odd - a three wheeled streamliner bus. WAT. In case I was mistaken, I bumped a few seconds, into the crossfade. Nope, definitely a three wheeler, and I have no idea what it is:

Bizarre car-spotting - Autobahn by Kraftwerk