https://vhelio.org/

I personally think it could be a great alternative to cars and bikes for those who need to take a whole family somewhere or a decent amount of stuff.

Only modifications I would make would be ride-by-wire and an extra set of pedals (so you can have two people pedalling without the annoyance of normal tandem bikes having to pedal at the same rate), and a more powerful motor (only 250W is legal in France, where this was designed, whereas 500W is legal here in Canada)