Last winter I gained a new appreciation for speed limits. During a month-long internship at the New York City Department of Transportation, I spent a lot of time working on safety initiatives to reduce speeding. I learned that 30 mph, the speed limit in most cities, is not arbitrary. A pedestrian hit by a vehicle going 40 mph is 3.5 times more likely to die than one hit at 30 mph. An entire... moreLast winter I gained a new appreciation for speed limits. During a month-long internship at the New York City Department of Transportation, I spent a lot of time working on safety initiatives to reduce speeding. I learned that 30 mph, the speed limit in most cities, is not arbitrary. A pedestrian hit by a vehicle going 40 mph is 3.5 times more likely to die than one hit at 30 mph. An entire campaign, “That’s Why It’s 30,” is built around this fact. view page