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Overall, traffic fatalities in the United States have dropped precipitously due to increased regulation and innovation. Sadly, though, the drop in traffic fatalities is not consistent across all neighborhoods. Research published in the American Journal of Epidemiology found that fatal crashes have decreased for those with higher degrees, but have increased for those with less than a high school diploma. The paper presents a range of reasons for this, including older and less fancy cars and lack of street amenities like crosswalks.
For other observations, read the article on the Washington Post.