Today, after some storms in the area, I was FSDing down the road and at an intersection that was totally powered down, FSD made as though to just roll through the intersection (as a handful of human driven cars were doing). Since I had no-one directly behind me, I disengaged with the brake to treat the intersection like a 4-way stop, and hit the "[Critical]" button for the FSD team. A couple of hours later, I checked with Grok about Alabama law as regards to powered down intersections and got a surprise! ALDOT recommends treating such intersections as all-way-stops, but in truth they legally should be treated as simply uncontrolled intersections, which is another beast altogether. In the specific situation I was in, FSD would have been fine rolling through the intersection as it had obviously intended, as were the human drivers in the other cars on the road with me. Live and learn. Note that other states may have different laws concerning unpowered traffic lights.