Some three wheelers have one wheel in the front, some have one wheel in the back That wasn't enough for the Scott Sociable though, it had to have it's one front wheel in line with the driver side rear wheel. It looks like a four wheel car minus one front wheel. I wonder how it was to drive...
https://en.m.wikipedia.org/wiki/Scott_Sociable
https://en.m.wikipedia.org/wiki/Scott_Sociable