Despite efforts to reduce pedestrian deaths, many cities have become more dangerous for walkers in recent years. Alessandro Scagliusi / EyeEm/Getty Images/EyeEm hide caption
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Indian villagers walk past an overturned motorized rickshaw. Narinder Nanu/AFP/Getty Images hide caption
Tough helmet laws have caused the number of helmet wearers in a Vietnamese province to jump from 34 percent to 76 percent. Thomas Janisch/Moment Editorial/Getty Images hide caption
City centers can be risky for pedestrians, but age, race and gender matter, too. iStockphoto.com hide caption
Americans walk less than the citizens of any other industrialized nation, says Tom Vanderbilt. In this file photo from last summer, pedestrians and a cyclist cross the Brooklyn Bridge in New York City. Chip Somodevilla/Getty Images hide caption
According to the Pedestrian Aggressiveness Syndrome Scale, if you find yourself "feeling stress and impatience when walking in a crowded area," you may have sidewalk rage. sculpies/iStockphoto hide caption