Every morning and every evening the fleet glides through the city, hundreds of white buses with tinted windows navigating San Francisco's rush hour. From the pavement you can see your reflection in the windows, but you can't see in. The buses have no markings or logos, no advertised destinations or stops.
It doesn't matter. Everyone knows what they are. "Transport for a breed apart. For a community that is separate but not equal," said Diamond Dave Whitaker, a self-professed beat poet and rabble-rouser.
The buses ferry workers to and from Apple, Facebook, Google and other companies in Silicon Valley, an hour's drive south. They hum with air-conditioning and Wi-Fi. They are for the tech elite, and only the tech elite.