As soon as I started driving my old Land Rover around town I started getting the “thumbs up” gesture from other drivers. Almost always with a smile. This gesture is clearly meant to convey something positive. They like/admire the Rover. Wikipedia has a page on the history of the gesture. I love getting the thumbs up and started wondering why there are not more universally (at least in English speaking countries) recognized gestures between motorists. The only other one I can think of is The Finger. The other end of the approval spectrum, if you will.