If you haven't had at least seven hours of sleep in the last 24, you probably shouldn't be behind the wheel, traffic safety data suggests. Katja Kircher/Maskot/Getty Images hide caption

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Katja Kircher/Maskot/Getty Images

Drivers Beware: Crash Rate Spikes With Every Hour Of Lost Sleep

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In 23 states and Washington, D.C., the nighttime driving restriction for unsupervised teens begins at midnight or later. Getty Images hide caption

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Most Nighttime Crashes With Teen Drivers Happen Before Midnight

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Although Uber has repeatedly extolled drunken-driving reduction as a benefit of its service, a new study of data from across the U.S. finds ride-sharing apps have had no effect on alcohol-related traffic fatalities. Eric Risberg/AP hide caption

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Eric Risberg/AP

Efforts aimed at teen drinking and driving help reduce deaths, but so do broader alcohol control efforts. Roy Morsch/Corbis RM Stills/Getty Images hide caption

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Roy Morsch/Corbis RM Stills/Getty Images

Police officers check drivers at a sobriety checkpoint in Escondido, Calif. Lenny Ignelzi/AP hide caption

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Lenny Ignelzi/AP

Traffic Stops Persuade People To Avoid Drinking And Driving

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The BACTrack Vio keychain breathalyzer and app on the iPhone at NPR headquarters in Washington, D.C. A public health researcher says tools like this could help people make better decisions about alcohol use. Meredith Rizzo/NPR hide caption

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Meredith Rizzo/NPR