Too slow is one issue, and off-speed merging another we all tolerate... but some drivers think they alone are immune to speed laws. AND, believe we are in their way.
In middle or right lane - generally at or about speed limit, we sometimes have a driver ride up on our rear and begin blinking high beams, as if that's a legal 'get outta my way signal' ... It's not, and never works.
What do they want us to do, move out of the slower lanes into the fast lane, so they can speed past us on the right?? Never can figure that one.