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Anthony Rowe, an associate professor at Carnegie Mellon University in Pittsburgh, wants bikes to feed information to nearby cars to avoid collisions. His bike is fitted with an array of precise instruments and a battery hidden in the water bottle. Margaret J. Krauss/WESA hide caption

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Margaret J. Krauss/WESA

Bikes May Have To Talk To Self-Driving Cars For Safety's Sake

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British Transport Secretary Chris Grayling, seen here after a Cabinet meeting at 10 Downing Street, is seen opening his car door on a passing cyclist in a video that was captured by a bike rider in London. Justin Tallis/AFP/Getty Images hide caption

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Justin Tallis/AFP/Getty Images

Leahya Ellis and other spinning class participants use exercise as a way to shake away stress, anger and depression. Bastiaan Slabbers for NPR hide caption

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Bastiaan Slabbers for NPR

Biking Behind Bars: Female Inmates Battle Weight Gain

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Peloton's New York City cycling studio has a television production facility so that subscribers, using bikes equipped with a waterproof tablet, can ride along at home. Issac James/Courtesy of Peloton Cycle hide caption

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Issac James/Courtesy of Peloton Cycle

Beyond Jane Fonda Tapes: Home Workouts Go Virtual

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A diagram released by the city of Paris shows how cyclists will be able to pass through intersections during red lights. In some cases, they can turn right; in others, they can go straight through. City of Paris hide caption

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City of Paris

Cyclists can now call AAA and other groups for help when they run into trouble during a ride. Here, cyclists ride near the White House in Washington, D.C., last autumn. Mladen Antonov/AFP/Getty Images hide caption

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Mladen Antonov/AFP/Getty Images

A Wyoming man has won a Supreme Court case fighting efforts to route the Medicine Bow Rail Trail through his family's property. On this map, the trail is the unmarked route moving from the lower right toward Fox Park, where Marvin Brandt lives. Google Maps hide caption

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Google Maps

No more helmet hair: Hovding's "invisible" helmet is an air bag tucked away in a collar that gets fastened around a cyclist's neck. It's aimed at urban cyclists and priced at $535. Courtesy of Hovding hide caption

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Courtesy of Hovding

Electric bikes made by French company Moustache are displayed during the Cycle Show 2013 in Paris last month. Charles Platiau/Reuters /Landov hide caption

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Charles Platiau/Reuters /Landov

Electric Bikes Trendy in China

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