Traffic light failures are always a delight. Normally they fail completely or at least once they have failed they are turned off completely. Last night on the way I home I encountered a failure at a significant T-junction where they were stuck on green in one direction and red in another. Probably the deadliest circumstances. After a while people waiting (for a very long time) at the red light would realise they had failed and would tackle the junction, with cars speeding towards the green lights oblivious to the fact they had been on green for ages. Eventually a car got to the head of the red light queue and sat there, and sat there, and sat there. Clearly they had no intention of going through them. I found an alternative way home.