“For autonomous vehicles that rely on smooth roads and clear signals, a broken traffic light could conceivably pose a major problem.

To get around the problem of a missing green light, self-driving car company Waymo trained its vehicles’ artificial intelligence to detect and respond to the arm movements of a traffic cop as they wave traffic through an intersection, according to CNET — and you can watch it on YouTube…”

Source: https://futurism.com/self-driving-car-obey-police-hand-signals/