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I was curious about the claims about Eno so I Googled a bit. Eno actually is responsible for a lot of these ideas being put in use, if not inventing them himself. He basically pioneered the concept of standardized traffic rules.
As for the stop sign, Eno proposed the idea in 1900:
Harry Jackson created his octagonal sign 14 years later, in 1914:
The invention of the roundabout is a bit more complicated. Circular intersections of some kind predated Eno, but they wouldn't all be considered roundabouts by our definition today.