“Slower Traffic Keep Right” is up there in the list of most misunderstood traffic signs. If someone wishes to overtake you and you are in the leftmost lane, please, please move over.
It is not only dangerous to overtake on the right, but also illegal in many places. Moreover, it encourages reckless driving since the speeding driver must weave from lane to lane in order to overtake traffic.
From an efficiency perspective, the “slower traffic keep right” logic allows for more consistent traffic flow.
I do not condone speeding. Speed limits are by no means suggestive, they are mandatory. However, the fact that someone chooses to engage in speeding behaviour is solely between themselves and the law. It has nothing to do with you.
The Germans have it working fine in an Autobahn context; it is also applied in France with similar results. Other countries’ drivers apply this logic properly and it’s stellar. North America, please understand.
There. I’m done with my rant.