Researchers at the Surface Transportation Policy Partnership in the 1990s developed the Pedestrian Danger Index (PDI) in order to establish a level playing field for comparing metropolitan areas based on the danger to pedestrians. The PDI corrects for the fact that the cities where more people walk on a daily basis are likely to have a greater number of pedestrian fatalities, by computing the rate of pedestrian deaths relative to the amount of walking residents do on average.
The PDI shows that the most dangerous places to walk are those that fail to make smart infrastructure investments that make roads safer for everyone.
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