I've found that Seattle drivers are unusually respectful of amber lights - probably because getting pulled over for abusing it is more common than never.
Interestingly, yellow light laws are different in different states — so in some places people are very respectful of yellow lights.
Most states say it's OK if you enter the intersection on yellow, but a handful (not including WA, but including neighboring OR) require that you clear the intersection before the red appears.
I've sometimes wondered if "entering the intersection" includes entering the crosswalk adjacent to the intersection.
