Laws for all 50 states here: http://www.mit.edu/~jfc/right.html
You’ll be surprised at how many states qualify it with the speed limit. Many simply state the maximum speed, while other state clearly state that you cannot be impeding traffic unless you’re going 10 miles or more under the limit.
Melas :”Your Honor, I was going 70, the posted, legal speed limit.
I saw no legal sign that said it was illegal to go 70 when there is 3 inches of ice on the road”