It's funny that you mention that. In the last decade I trimmed a number of houses on the border of Kansas and Oklahoma. It seemed strange driving down the streets there, everyone waves at you with a big hello smile. Slower paced.. farm community people... very friendly with time to say hello.
Around where I live, if someone waves at you it's with just one finger.
It's a shame that we are so caught up in ourselves that we can't take the time to say or at least gesture a hello.