Actually, several American car manufactured experimented with this idea in the 50's. Most notably Ford with the Nucleon [0], but also other brands such as Packa

Actually, several American car manufactured experimented with this idea in the 50's. Most notably Ford with the Nucleon [0], but also other brands such as Packard and (I believe) Cadillac were also designing nuclear powered cars. Eventually it was concluded that the shielding of the reactor would make a nuclear powered passenger car impractical, as it would make the vehicle too big. And of course there were the obvious safety concerns. There is an good documentary on this subject on youtube [1]. [0] https://en.wikipedia.org/wiki/Ford_Nucleon https://en.wikipedia.org/wiki/Ford_Nucleon [1] https://www.youtube.com/watch?v=kR5gefU87TY https://www.youtube.com/watch?v=kR5gefU87TY