Oh, I didn't mean for the lighting to be either/or (although I can see how my post read like that). I'm thinking more like the aura lighting on Culture drones - so for my example, auto mode might be blue, but tinged with more and more pink/red as it gets more worried (ie. lower confidence), a pulse of white if someone cuts it off, that kind of thing. Angry flashing red would be the equivalent of a human driver having a panic attack and taking their hands off the wheel.