California suspended General Motors Co.’s Cruise unit from operating driverless vehicles in the state, saying they’re not safe for public roads and that company officials misrepresented the details of an accident with a pedestrian.

The decision by the California Department of Motor Vehicles took effect immediately on Tuesday, and the agency said there’s no set length for the suspension. It’s a big setback for Cruise, which is also operating in Phoenix and Austin and laying the ground work to expand to multiple US cities and Japan.