Emily Badger reports on DC's homegrown rideshare program:

No one would believe this sight unseen: People here have created their own transit system using their private cars. On 13 other corners, in Arlington and the District of Columbia, more strangers Oliphant estimates about 10,000 of them every day are doing the same thing: “slugging.”

Their culture exists almost nowhere else. San Francisco has a similar casual-carpooling system, and there’s a small one in Houston. But that’s it. Even in D.C., slugging exists along only one of the city’s many arteries, I-95 and 395, where the nation’s first HOV lanes were completed in 1975. ... Each person benefits in pursuit of a selfish goal: For the passenger, it’s a free ride; for the driver, a pass to the HOV lane, and both get a faster trip than they would otherwise.

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