Now HERE is where I agree with you 100%.
When was the last time you saw someone using turn signals with any kind of consistency or planning, if they're used at all? And lane discipline is totally lost on most people. When the road veers left, most people are straddling the left lane marker, and when it veers right, they're straddling the right lane marker. And it's comical to watch most people exit from an expressway on a looping exit---not only are they nowhere NEAR the center of the lane, they're practically clipping off the standing lane markers on the inside of the curve. They have no CONCEPT of the fact that the rear wheels do not steer, or where the center of the lane is.
Finally, I always seem to have some 19-year-old, mouth-breathing girl, stressfully leaning forward in her seat inside the Saturn that her daddy just bought her (without realizing what a POS Saturns are), GLUED to my rear bumper, no matter what the speed limit. Someone didn't bother to teach this bubble-headed cell-phone jockey about stopping distances, either.
Driving lessons in the US are a complete JOKE. I'm really surprised the insurance companies haven't gotten involved to at least TRY to teach some kind of driving skills in this country.