What’s your point?
That YOU should get to control how fast someone else drives?
CO passed a similar law some years back, and even though I’ve never seen it actually enforced, it has changed the attitudes of most drivers, making everything more pleasant.
One of the toll roads has on it’s informational signs:
Be Polite
Keep Right
.....
It’s The Law
I live in MD (sadly near DC) and drive the highways. Everyone drives above the speed limit, even those in the far right lane. For you to be “passing” in the left and not holding up traffic, you could be pushing it up past 80mph (I know I’ve had to do it), which under MD law can get you a reckless driving ticket if pulled over.
The law would be unenforceable.