The ritual of casual carpooling, in which thousands of East Bay commuters join up with strangers each weekday for swifter trips across the Bay Bridge, thrives thanks to its essential quid pro quo.

Drivers pick up enough passengers to qualify for carpool lanes, saving 15 minutes to an hour or more in gridlock plus the usual $4 bridge toll. Riders get a free trip to San Francisco's Financial District.

And everybody gets to scare their friends on the East Coast by boasting about riding with strangers.

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