Oxymoronic Drivers

I'm thinking of adding "turn signal" to my collected oxymora. Drivers (here in California, at least) invariably only ever use them if it's already obvious which way they're headed, yet fail to use them when it would actually help. Take lunchtime yesterday, for example. I was waiting to turn right out of a parking lot, but there were 7 cars approaching from my left. I sat there watching as every single one of those drivers slowed down and pulled into the parking lot before they got to me. Thus, had I known, I could have exited at any time. Did any of those drivers signal to let me know that? No! Not a one.