In many municipalities there is indeed a lower limit, usually 10 below the posted maximum.
Allow me to clarify that, I believe it's for divided highways, controlled access highways like Interstates. Secondaries and tertiaries don't have a lower limit, that's why it's okay to drive something poky like a tractor on local roads but not take it onto I-75. Just make sure that SMV triangle is on the back and you're good.
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Lead or follow. Either is fine.
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