It really does make a difference to connect. I've been waving at drivers for years now. Laying back in the seat of a recumbent makes it seem only natural to wave or say a friendly "hey". It's good to see a video on the subject. Such a natural thing to do yet I rarely see cyclists wave at drivers. I'm a firm believer that a simple friendly connection makes a difference and keeps me saver. Maybe my wave will make a driver more aware of other cyclists. It can't do any harm so why not wave?