The whole yellow light issue is state by state. In most states you CAN enter the intersection and wait on a yellow arrow. Some states allow you to be in the intersection on a red, IF you are already there. Some require you to be completely out of the intersection by the time the light turns red.

Yellow lights are simply a caution. They do NOT mean stop. They indicate a red is coming, or in the case of turn signals, that the right-of-way is ending.
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"Nature has constituted utility to man the standard and test of virtue. Men living in different countries, under different circumstances, different habits and regimens, may have different utilities; the same act, therefore, may be useful and consequently virtuous in one country which is injurious and vicious in another differently circumstanced" - Thomas Jefferson, moral relativist