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1920 Accident in Baltimore during an icestorm.
Transportation safety has steadily improved in the United States for many decades. Between 1920 and 2000, the rate of fatal automobile accidents per vehicle-mile decreased by a factor of about 17. Except for a pause during the 1960s, progress in reducing fatal accidents has been steady. Safety for other types of U.S. passenger transportation has also improved substantially, but long-term statistical data are not as readily available.
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