An Uber self-driving car was just caught on camera running a red light in San Francisco. Today was the first day the cars were testing passenger pickup on the open road there.

Uber says the incident was the result of human error; the vehicle was being driven by a person at the time the video was taken, and there were no passengers inside.

A YouTube user known as Charles Rotter posted a video of the vehicle as it failed to stop at a red light, and drove through a crosswalk with a person clearly about to cross the street.