I wonder how a real self-driving taxi may look like if optimized for size. Something like Smart For Two, with upper part folding inside when not in use by human

I wonder how a real self-driving taxi may look like if optimized for size. Something like Smart For Two, with upper part folding inside when not in use by humans. This way it may be stored in a vertical carousel or otherwise optimize available parking space vertically while charging. I briefly thought about golf cart with folding tent shade above, but it is not that viable: climat control would be too complicated. But it may be actually a lower-grade variant for adequate weather or undemanding passengers.