Commuters in and around San Francisco rode into work for free on Tuesday morning due to an outage in the Clipper card system, which is used to handle payments for train, bus and ferry rides. "ATTENTION: The Clipper system is experiencing an outage on all operators this morning," the Bay Area Clipper account wrote in a post on X. "Please be prepared to pay your fare with another form of payment if required by your transit agency." Many buses were waving commuters on without asking for payment, and at Bay Area Rapid Transit (BART) train stations, the faregates were open, allowing travelers to walk through for free. Clipper is owned by the Metropolitan Transportation Commission, which manages transportation for the nine-county Bay Area. The service is used by hundreds of thousands of tech workers in San Francisco and Silicon Valley. The MTC website said there were 1.35 million unique Clipper cards — physical and digital — used in May, the highest monthly toll for the year and the most since December 2019, before the pandemic. A fact sheet from the MTC says Clipper is used by 800,000 transit riders a day across the region.