Re the turn signal thing above...

The difference between small-town driving and big-city driving in a nutshell:

In a small town, turning on one's turn signal to signal a lane change means "May I come over, please?"

In a big city, turning on one's turn signal to signal a lane change means "I'm coming over!" If you wait for drivers in Atlanta to be courteous, you'll run out of gas before you ever get off the Loop.