Two things. First, the coloring is odd. Generally red = bad, green = good. But here the state with the best law is red, second best is blue, third is green — assuming a “safe distance” law has any meaning whatever.
Also, when PA passed its law I had the distinct impression that we were simply matching one other state, not going further than any other state. Oregon? But I don’t see any other state with a four-foot passing law.