Ariel Atom is street legal. Don't believe the $200K sticker price; they are available for only $40-50K. (sigh)
Atomic Car, found around the side of a building in Belleville, WI.
Grown up version of a go-cart? Ariel Atom
Atomic Concept 1950's
Hyundai Sonata Hybrid Atomic Tail Lights: Minutiae of the Minute | PlaysWithCars
A model of the Nucleon, an atomic car conceived by Ford but never built, is displayed in 1958.
Ford FX Atmos 1954 concept car Car Life Magazine July 1954 ONE of the wildest “dream” cars ever to roll out of a Michigan experimental laboratory is the creature shown above
Ford Nucleon: atomic car concept