I have heard that the yellow light is a warning that red is coming and also
a method of allowing time for the intersectin to clear before the next light
change.
One of the problems I see is that if there are 3 or 4 lanes in each
direction, the intersection is very wide and takes a lot of time to get
through.
Each intersection is supposed to be engineered in accordance with Federal
Safety
standards. And, these very wide intersections are supposed to have a longer
lasting yellow light. They don't always. A friend beat a red light ticket
by proving exactly this point. If you entered the intersection at the very
last touch of green, it was impossible to get through and out of the
intersection cleanly and at a safe speed before the light turned red.
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