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Re the drafting chapter, I do think you need to get into real-world traffic spacing, especially on e.g. California freeways. (Presumably elsewhere, but my personal experience is Northern California, & Northern Nevada in what passes for heavy traffic hereabouts.) The plain fact is, you're going to be spending the majority of your time a couple of car lengths from someone's rear bumper, 'cause if you try to leave more space, someone else will cut in.
That being the case, I think I'd rather be behind a semi with one of those nice bars designed to prevent rear-enders from going under, than just about anything else I can think of.
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