This totally unrelated reply raised my question about traffic lights.
I am starting to think that my chinese head lamp is a magical instrument, every time I go near traffic lights they turn green. It is hilarious to drive in heavy-traffic and just that you get green lights! Perhaps just a placebo feeling so I want to know how your traffic lights behave to you when you are driving within other traffic? How do they notice you with/without lights?
Well, I need to explain how it works. I have head lamp with blinking white light and particularly when it is very dark, the traffic lights are clearly programmed somehow to detect the intensity variation of lights and then turn green. I have heard that emergency cars show some kind of special light to turn lights green for them. But I suspect whether the head-lamp contains some special light, it was the cheapest model I found from eBay.