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> I do drive in the slow lane frequently - and this still occurs.

One part of your post was about people passing on the right. People won't do that if you're in the rightmost lane.

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The idea of cruising 15km/h over the limit is absolutely crazy to me. That will get you 3 points and a minimum $500 fine here. We have "average speed zones" too!
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Where I live travelling at that speed will get you passed by every cop and state trooper driving on the same road. A lot comes down to local norms and enforcement.
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In Alabama on the interstates and highways the rule of thumb is: "8 you're great, 9 you're mine."
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