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DC has an informal carpool tradition at rush hour... commuters line up and wait for a single driver who wants to use the high-occupancy vehicle (carpool) lane on I-395 heading into the Virginia suburbs. They call these "slug lines." I'm not sure where the term came from, but there's a web site about it.
Washington DC headquarters of FINRA (formerly NASD), financial industry's self-regulatory body. 1735 K Street.
Neighboring building of 1725 K Street, which is being torn down. March 18, 2008.