Driving around home (more country roads) I tend to wave to most vehicles and some wave back but this one neighbour up the road she has never waved in the 10 odd years we have lived here and I am often tempted to lift a different finger off the wheel at her just to see if she opens her eyes when she drives but I would never do something like that (and don't feel it is worth my time). I think it is good when people give a friendly wave