https://www.cnet.com/roadshow/news/gm-sued-over-self-driving-car-crash-with-motorcyclist/

A backup human driver -- which GM refers to as an Advanced Vehicle Trainer -- was present in the Chevy-Bolt-EV-based vehicle.

The accident happened in San Francisco on December 7 amidst heavy traffic. The lawsuit, filed in US District Court in San Francisco, alleges that the Cruise test vehicle "suddenly veered back into Nilsson's lane, striking Nilsson and knocking him to the ground." According to the San Francisco Police Department's accident report, the incident occurred at relatively low speeds, with the Cruise test vehicle driving at 12 mph and the motorcycle traveling at 17 mph.