This is an interesting discussion. I’ve had a few loonies rage at me. How do you handle when drivers follow you way too close, like if you have to brake they might rear-end your car? I’ve had this happen a few times and it’s never because I’m driving under the limit, I usually speed moderately at 20% over. My solution has been to ease my foot off the accelerator to slowly slow down to give them a hint. Some catch on and back off, others get aggressive.
Edit: I should note that speeding up isn’t always possible because in some cases I’m behind someone else at a safe distance.
Those that don’t drive in the right-most free lane when not passing should be ticketed. Maybe that would help.