Yep, people don't know the "rules of the road". I will slow down to let someone on IF that doesn't cause other problems. Sometimes you can do nothing except maintain your lane and speed:
We were on the highway around rush hour with a packed highway, going around 60 or a little less. Come up to an entrance ramp and a guy in a car came up the ramp (at highway speed or even more) and almost sideswiped me. Kids and wife yelling that he was there, my response was "I know he's there, but there is absolutely no where for me to go...". The guy managed to see me just before he hit. From what we could tell he was using a "hands free" cell phone, engrossed in his call. Wife said it looked like he was talking to himself and he had a doohickey in his ear... She saw it when he finally turned to look at traffic and saw my F250 emblem next to his window... considering he was about 18 inches away, it was easy to see...
There I go! I went and planted a seed to derail this thread... sorry, lol!