As I drive around in my SUV I see more and more bikers out there on the road. I see them wave to each other, much like we do in my line to work to fellow EMS/Fire personnel and police do to each other. I assume that's a matter of respect and just saying "Hey how ya doing?" Also, it peaves me when I see other auto drivers get up on the tail or try and cut off motorcycle drivers on the road. I try and put at least a car length between me and a biker if I see one. What is appropriate for auto/biker etiqutte?