Comment by whimsicalism

4 days ago

TIL traffic lights in SF don’t have a backup power flash red mode.

is that what flashing red indicates? I thought it might be that signalling is broken, possibly centralized.

  • It indicates an intersection fault. I've seen it happen in front of me in Texas when lightning struck too close to the cabinet.

  • sometimes it just means it’s too late at night to worry about traffic lights so just treat it like a stop sign.