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Here's something subtle.
US 71 in Kansas City is built to freeway-grade and is a natural extension of I-49.
However, as it passes through a random neighborhood, it reverts down to city streets for about 2 miles.
It has just TWO level intersections, and they are the most dangerous in the whole region.
This is the result of a "freeway revolt" back in the day, and this was the compromise that was supposed to avoid splitting up the neighborhood. Now we have the worst of both worlds.