Why don't we have more golf carts or similar vehicles on urban streets? I assume they're electric and easily rechargeable? Strikes me as a decent, existing platform upon which to build variants - could have a larger tray at the rear, netted storage at the front, etc.

RV parks and campground hosts and some retirees use them for getting about in a very local context. I know they're probably serve a lot of the needs I'd have in a second car.