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Speed bumps save lives by forcing drivers to slow down, which gives everyone more time to react and makes crashes less severe. In U.S. studies, speed humps were associated with a 53% to 60% reduction in the odds of injury or death among children struck by a car in a neighborhood, and one Los Angeles study found a 37.5% reduction in motor-vehicle incidents involving pedestrians under 21.
Why slower traffic matters
Crash risk rises sharply with speed because stopping distance gets longer and impact force increases. That means a pedestrian hit at a lower speed is much more likely to survive or avoid serious injury than someone hit at a higher speed. Traffic calming also helps drivers notice children, cyclists, and parked cars earlier, especially on residential streets.
U.S. evidence
The strongest U.S.-specific numbers in the sources I found come from neighborhood traffic-calming studies. One study cited in the literature reported a 53% to 60% drop in the odds of injury or death for children struck by a vehicle in Oakland, and another found a 37.5% decrease in pedestrian crashes for people under 21 in Los Angeles. A broader review of traffic calming found injury-related crashes fell by about 10% to 25% overall in urban areas.
Plain-English example
Think of a speed bump as a very simple safety filter: instead of letting cars move through a neighborhood at 30 or 40 mph, it nudges them closer to 15 or 20 mph. That difference can be the line between a near-miss and a fatal crash, especially near homes, parks, and schools.
