A self-driving Uber that struck and killed a woman in Arizona in March recognized her as a pedestrian but didn’t attempt to avoid her because of a software setting, sources told the technology news website The Information.

Uber executives believe the software designed to prevent the car from overreacting to insignificant hazards wasn’t dialed in properly. As a result, the system, which normally flags-then dismisses-things like plastic bags and other minor obstacles, decided not to take evasive measures when it encountered 49-year-old Elaine Herzberg, who was walking her bike across a dark section of road in Tempe.

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