Uber has been utilizing self-driving cars, mainly in tech hot-spots like Tempe, AZ. The Uber self-driving car collided with another vehicle that failed to yield while making a left turn.

USA Today reported: It was “uncertain” whether the car was driving itself at the time of the accident or if the operator sitting behind the wheel was in control, said Tempe police Sgt. Damon DeSpain. Uber, on its website, stressed the use of the vehicles is in its early stages.”While Uber is still in the early days of our self-driving efforts, every day of testing leads to improvements,” the website says, referring to the self-driving car program. “Self-driving cars have the potential to save millions of lives and improve quality of life for people around the world.

If the car’s autonomous system was in control during the wreck, then it raises question whether or not a human driver would have been able to avoid collision with the other car.

Google is another major company using autonomous vehicles. Not only do self-driving cars raise safety questions, but also surveil the public according to World Economic Forum insiders.