According to Bloomberg's account of the report, it faults the green Honda that turned left into the autonomous Volvo. The Uber employees sitting in the car's front seat confirmed that it had been set to autonomous mode, and in a statement to the police, said their vehicle was traveling 38 miles per hour, just under the 40 MPH speed limit. But one witness, who didn't realize a human wasn't in control, said that the Uber had appeared to accelerate to make it through the yellow light.
What little details we have provoke questions about the autonomous car's capabilities and decisions. Did its sensors not catch the yellow light? Or did it make a judgment call to enter at a more dangerous moment than waiting for a green? Whether the Uber took an unnecessary risk is unclear, especially since the circumstances aren't certain: For one, the green Honda driver maintained that she couldn't see the autonomous Volvo approaching, while the employees sitting in the Uber stated that they couldn't see the turning car because their vision was blocked by traffic.