"These three cars for the future were shown by General Motors at the New York World's Fair. Top is Runabout, a three-wheeled utility vehicle for the future city-dweller, featuring a built-in shopping cart system. Centre is the Firebird IV for fast, comfortable cruising on automatic highways. Bottom is the GM-X, a two-passenger, high-performance coupe appealing to the enthusiast."
S.C.H. Davis. Cars Cars Cars Cars. London: Paul Hamlyn, 1967.