The minimum speed on Interstate highways is?

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The minimum speed on major routes (if any) varies by state. As an example, in many jurisdictions the minimum speed on a 65 MPH Interstate is 45MPH.

Most states have a catch-all rule that states you can be ticketed for driving at any speed that is so slow as to impede the flow of traffic.
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What is the minimum speed in the left hand lane of the interstate?

Most of the time, if you're driving below the speed limit, you are to remain in that right hand lane. Now there are some places where they do place a minimum speed in the left