[St_Thomas_Aquinas]

Throw a plastic bubble over the passenger compartment, and you have a great, all-weather commuter vehicle. Or add another wheel, and you have a more stable trike.

Actually, I read in Car & Driver of a company that is finally doing this. It's an extremely aerodynamic trike. Estimated mileage? 300 mpg.

[Wonder Warthog]

http://thekneeslider.com/lit-motors-c1-self-balancing-fully-enclosed-electric-motorcycle/

Electric motorcycle, enclosed, gyroscopically stabilized.

[Disambiguator]

Throw a plastic bubble over the passenger compartment, and you have a great, all-weather commuter vehicle.

You should look up the Monotracer. It's exactly that.