The most annoying are those that don’t know how to merge off the interstate. The sign says Yield, it does not say Stop.
Using the exit ramps as a passing lane (they aren’t “mistakenly” in the lane, they cut off those who are merging onto the highway just so they can pass one car in the lane adjacent to the exits).
Obviously, nobody in the controlled access driving lane will ever move over for these morons because they are stopping.
Even more annoying is a driver who stops at a green traffic signal, it happens way more than you might think. Just observe the timid folks who want a green arrow to make a left turn when there isn’t one displayed at the moment, but the light is green. If you are in the lead and parked at a green light, expect to be reminded that green means go.
Or how to get on the interstate. They hover in the on-ramp, neither slowing down nor speeding up to merge into traffic. They expect the other drivers to accommodate them, to read their minds. Maybe they expect me to just stop altogether and let them get on. I think their basic strategy involves closing their eyes and hoping or praying they will get on without crashing.
Or those who don’t know how to merge onto an Interstate or Expressway. They put the “ass” in “assimilate”.