> Have you used it, by the way? I have not used FRED no, but living in Europe, I have frequently come across dynamic stop lights, yes. > A speeder crosses tha

> Have you used it, by the way? I have not used FRED no, but living in Europe, I have frequently come across dynamic stop lights, yes. > A speeder crosses that same trigger point [..] Do they get a free green or do they make your light turn red. Normally they are not controlled via a single trigger point, but with a dynamic radar system. So even if you come in too fast, turning the light red, it can still switch back to green if you slow down in time. I don't know how the beam discrimination works if it detects scatter from a faster moving object behind you, but in practice I've never encountered a scenario where I was forced to stop because someone was coming in faster from behind.