Ford Seattle-ite XXI

The Ford Seattle-ite XXI was a three eighths scale concept car designed by Alex Tremulis and displayed on 20 April 1962 on the Ford stand at the Seattle World's Fair. It carried ideas that later became reality, including interchangeable fuel cell power units, interchangeable bodies, interactive computer navigation, mapping and car information systems, and four driving and steering wheels. The concept allowed for a compact nuclear propulsion device as a possible power source, on the assumption that radiation issues could be solved without prohibitively bulky shielding. It had six wheels, four steerable ones at the front and two fixed ones at the rear, which the designers judged would improve tracking, traction and braking. An interchangeable front powered section let the car serve either as an economical city runabout or as a powerful transcontinental cruiser.