This second-generation prototype of a marijuana field tester being developed at Washington State University is larger than the planned final product. Tom Banse/KUOW hide caption

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At 72, Robert McSherry says he's not yet ready to quit driving or ready to plan how he'll get around when that time arrives. But he's happy to get the insurance discount that comes with taking a driver safety class. John Daley/Colorado Public Radio hide caption

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Jed Brown drives 100 miles each day to work between Pennsylvania and West Virginia. Cheaper gas is making his commute more manageable, but he doesn't expect the low prices to last. Uri Berliner/NPR hide caption

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In order to secure a career as a stuntwoman, Georgia Durante would show up on Hollywood film sets asking for work. At first, directors ignored her. Then they saw her drive. Courtesy of Georgia Durante hide caption

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A view of Interstate 65 in Alabama through bioptic lenses, which allow people who are severely nearsighted to drive. Dan Carsen/WBHM hide caption

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More elderly drivers will hit the road in the next decade, but family members wonder: When is it time for elderly loved ones to move to the passenger seat? Martin Novak/iStockphoto.com hide caption

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Drivers under 25 are more likely to send text messages and make calls behind the wheel. They're also less able to handle distractions while driving. iStockphoto.com hide caption

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