The California Department of Motor Vehicles on Tuesday formally revoked its permit to Pony.ai for testing robocars with safety drivers, representing a setback for the Toyota-backed unicorn in its ongoing effort to develop self-driving technology. A government official cited evidence of “numerous” safety violations by human drivers as the cause for canceling the permit, TechCrunch reported on Wednesday. Pony.ai responded to the announcement by stating that it is still reviewing the DMV’s notice and that no injuries have been reported during its 6.8 million testing miles amassed since 2017. In November, California regulators also suspended the company’s permit to test fully autonomous cars without a human driver following a reported crash in Fremont a month earlier. [TechCrunch]