I was in Jamestown a few weeks back and someone had a buzzer or something that he had on his handlebars. It was not shrill or alarming but loud enough to let me know he was coming a different kind of sound. It was really cool. I let people know I am coming if they are waddling or biking in my lane. Usually if it is another biker they are riding faster than me anyways but the pedestrians are another matter. The Va capitol trail will have a group waddling across the whole path, don't they know it's a bike path. I appreciate someone letting me know they are coming. They don't have to do it but they do most of the time and I appreciate it. I think for the most part in the short time I have been riding that the biking community in general is pretty cool and polite.