San Francisco has sued a California commission, contesting its approval of a robotaxi company’s expansion despite recent safety problems raised by the city.

City Attorney David Chiu filed a suit to a state appellate court against the California Public Utilities Commission, or CPUC, last month, first reported by the Washington Post on Tuesday. Last year, the CPUC approved two major driverless taxi companies, Cruise, the arm of General Motors, and Google-owned Waymo, to operate an autonomous pickup and drop-off service in the city at all hours of the day.