IME using the shoulder/"emergency lane" is only done on one lane roads and the like in the US, and even then it's discouraged because the driver is more likely to run into trouble from road debris. There tend to be turn-outs where they're needed, for instance on extended single lane roads with no ability to pass. In every other (multi-lane) situation the usual "drive right, pass left" applies. For whatever reason a significant portion of truck drivers in CA, IME of course, seem to think "tailgate until they go faster" (unless of course they see a LEO) is the way to go.
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