The car traffic that just cannot drive well. It's not all of them, but the examples can go on for paragraphs. Like the guy/gal doing 30-40 over the speed limit and switching lanes that jumps in front of you and slams on the brakes. Because there is a reason you are going 55mph, he was just too busy thinking of himself to see it.
Or the guy/gal who waits for the last second to get off the same ramp you are taking then slams on the brakes since he is not exactly sure, but knows he needs to slow down cutting your stopping distance in half.
Then guy/gal that sees you coming down the ramp and even with a clear lane to the left does not move over to let you merge. At the same time they do not want to end up behind you so you have to slow down and then try to pick back up momentum and merge in the midst of a group of cars showing the same or less courtesy.
Truck drivers I think give me the most courtesy on the road and I try to give them the same in return. They at least leave the lane when something slow is about to merge, I have seldom had them change lanes in front of me and slam on the brakes. Even at the truck stops I don't seem to get any odd looks even though I use their lanes since I follow their rules for fueling.
Maneuvering the rig is my least stress when you compare it to driving around most of the east cost drivers.
