Because in most states (presuming you're in the US) it is incumbent on the slower traffic to move right. In some nations (Germany) it is illegal for slower traffic to impede faster traffic when the slow lane is available for the slower traffic to merge into. It is also illegal for the faster traffic to pass on the slow side. I know the terms seem odd but I forget if Germany is left-fast, right-slow or vice versa. In short, if the slow lane was open and you were toodling along in the fast lane impeding faster traffic, even if it is one vehicle in a 100 stretch mile of road, you are the problem.
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