In March 2018, there was a temporary pause to Uber's self-driving vehicle testing after the death of Elaine Herzberg by an Uber self-driving vehicle in Tempe, Arizona.  According to police, the woman was struck by the Uber vehicle while attempting to cross the street, while the Uber engineer in the vehicle was watching videos on her phone.  Uber pulled its self-driving cars off all public roads and reached a settlement with the victim's family.  There was disagreement among local authorities as to whether or not the car or the victim was at fault.  In December 2018, after receiving local approval, Uber restarted testing of its self driving cars, only during daylight hours and at slower speeds, in Pittsburgh and Toronto.  In March 2019, Uber was found not criminally liable by Yavapai County Attorney's Office for the death of Herzberg.  The company changed its approach to self-driving vehicles after Herzberg's death, inviting both Waymo and General Motors’ Cruise self-driving vehicle unit to operate vehicles on Uber’s ride-hailing network.  In February 2020, Uber regained the permit to test self-driving vehicles on public roads of California with backup drivers. The company is going to resume testing in San Francisco, where its main office is based.