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I think there's a few seconds in it as techically going through at amber isn't illegal if it's unsafe to stop (i.e. slamming brakes on and locking up).
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They have a timer built into them, they become active at a certain point after the light turns red, and de-activate at a set point before they go red/amber.
I don't know what the set times are, 1.5sec rings a bell though