I never heard of such a law. Is there a uniform minimum or is it graduated to correlate with the different speed limits....70, 65, 55?
I had a bad experience just about an hour ago with a slow driver in the left lane and on the phone. He was oblivious to all.
It doesn’t matter what speed. It’s not enforced much if at all. Basically, if you are in the left lane and don’t move to the right to let another car pass you can be pulled over and ticketed.
We also have some areas where it’s posted “Trucks Use Right Two Lanes” but that’s never enforced either.