So a red light turns on. What does it mean? For the next 0.5 s you don't know. Maybe it will turn off, maybe it won't. In the meantime, you have delayed your br

So a red light turns on. What does it mean? For the next 0.5 s you don't know. Maybe it will turn off, maybe it won't. In the meantime, you have delayed your braking action and decreased your margin of safety. Or you have started braking for no reason, endangering people behind you (and yourself).