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This and no hills... which means you have lots of options for routes, because everything's on a damn near perfect grid. Which also makes most of the situations the car encounters much simpler. No strange 5 way stops, no angled or offset intersections. Not even any curves to have to navigate. More opportunity to make 3 rights instead of a left, which these cars seem to be struggling at.

Since when does Arizona have no hills? Most states in the US are flatter than Arizona.

Phoenix has interesting geography. I struggled to describe it, so I checked Wikipedia, which has this succinct description:

"Other than the mountains in and around the city, the topography of Phoenix is generally flat, allowing the city's main streets to run on a precise grid with wide, open-spaced roadways."


Possibly, the flat image might come from Arizona being flat where a large number of the people live, like Phoenix and its outskirts.

Grandparent's "damn near perfect grid" comment also jives with the layout of much of Phoenix.

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