Test drove a Smart Car, which is surprisingly roomy. It turns out all they did was lop off the back.
It's a rather springy ride and gets comparable mileage to a hybrid, though for half the price. Which makes sense because it's only half a car. (See above.)
There's also a year and a half waiting list to get one, which seems an unusually long time for such a short car. I mean, shouldn't they be able to build them twice as fast as other cars? Extending this logic, a mini-van should have a six-year waiting list.
But as someone who turns every K turn into an HIJK turn, I find the notion of this motorized baby carriage very appealing.