When I drive, I always pay attention to the first stoplight and decide what the day will be like.
The second stoplight is just as important, and its meaning is similar to what I've just described above. It tells me what to expect next, in response to the outcome of the first light. You can imagine that, for example, a red light followed by a green light tells me that a moment of patience gives way to renewed momentum. It would take a while to explain each possibility, but you can probably work it out.
By the third stop, the stoplight doesn't mean anything at all.
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