Some states (forget which I was driving through) have posted minimum speeds on highway. Others I'm sure there is a generic lower limit "clause". I've never se

Some states (forget which I was driving through) have posted minimum speeds on highway. Others I'm sure there is a generic lower limit "clause". I've never seen a state that didn't have a "at a speed safe with current rode conditions". So, that you can still get a ticket going 65 in a 65 but there happens to be a blizzard going on. I doubt any state requires you to go exactly the posted speed limit.