Comment by adrianmonk
3 days ago
I wonder how Waymos know that the traffic lights are out.
A human can combine a ton of context clues. Like, "Well, we just had a storm, and it was really windy, and the office buildings are all dark, and that Exxon sign is normally lit up but not right now, and everything seems oddly quiet. Evidently, a power outage is the reason I don't see the traffic light lit up. Also other drivers are going through the intersection one by one, as if they think the light is not working."
It's not enough to just analyze the camera data and see neither green nor yellow nor red. Other things can cause that, like a burned out bulb, a sensor hardware problem, a visual obstruction (bird on a utility cable), or one of those louvers that makes the traffic light visible only from certain specific angles.
Since the rules are different depending on whether the light is functioning or not, you really need to know the answer, but it seems hard to be confident. And you probably want to err on the side of the most common situation, which is that the lights are working.
I recently had a broken traffic light in my city, it was daylight and I didn't notice any other lights that should be on during the day to be off.
My approach was to get closer into the intersection slowly and judge whether the perpendicular traffic would slow down and also try to figure out what was going on or if they would just zip through like if they had green.
It required some attention and some judgement. It definitely wasn't the normal day to day driving where you don't quite think consciously what you're doing.
I understand that individual autonomous vehicles cannot be expected to be given the responsibility to make such a call and the safest thing to do for them is to have them stop.
But I assumed there were still many human operators that would oversee the fleet and they could make the call that the traffic lights are all off