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This is similar to the rule that you should be able to see 12-seconds ahead of yourself. If you're stuck behind a semi-truck trailer or some other type of vehicle that obstructs your view, then you should slow down significantly to account for being unable to see well.

I was talking to one person about passing through traffic lights, and he mentioned that sometimes if you're behind a semi-truck that you won't notice that the light has turned red until you're already in the intersection, to which I responded, "well, you're following it too closely then!"