When you coming out of parking lot trying to turn right, but you can't because the person in the left lane pulled all the way forward and you can't see passed them. Now I drive a truck so most of the time I can deal with it if the other person is in a car, because I can see easily over their much lower car. But when another truck does it, yeah, can't see anything.
That is just as bad as when you trying to turn right out of a parking lot and you see a car coming so you sit there and at the last moment they turn their signal on and turn into the parking lot. I be thinking damn it if you turned on your signal much earlier like you suppose to do, I could have been turned out the parking lot. People in New England do this all the time, drives me nuts when they wait until they are at the turn before they turn on their signal.
My third grinder is, if it is raining outside, turn on your freaking headlights.

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