The 1966 book Automobiles of the Future features these images of General Motor's Runabout concept car. Besides having three wheels it also features a built-in shopping cart that slides out of the trunk:
Two views of the GM three-wheeled Runabout. This car of tomorrow is fitted with two shopping carts that make up the car's trunk area. The experimental design has been operated with all-electronic controls in proving ground tests.
GM Car of the Future (1962)
Automobiles of the Future (1966)
Sports Car of Tomorrow (1966)
Magic Highway, U.S.A. (1958)
The Future World of Transportation