The Brompton enthusiasts here may already know this, but this is new to me:

https://youtube.com/watch?v=lAM-Oh-gfrM

Neat.

Yes it's interesting. However, maybe you should follow the experiences of the guy who tried to ride one from North Wales to Brussels. It isn't that far, maybe 400 miles or so, but the Nano lost traction and broke down. I believe the gears in the geared motor had failed and that this is not the only case of this happening. Check it out yourself carefully. I'm not saying they mechanism is seriously flawed - anything can break, obviously, but there is a question mark over the technology in that motor.

https://www.capandshare.org/willbikeblog1.html