There was an attempt in the 60s Late 70s, I think (Carter administration). I remember those. As a kid I wondered, "will they put in kilometer-marker signs lik

There was an attempt in the 60s Late 70s, I think (Carter administration). I remember those. As a kid I wondered, "will they put in kilometer-marker signs like the mile-marker signs on state roads?" (the small white ones near road level).