lol, I've found something similar once I bought a pickup truck and a really loud obnoxious horn! Every time I see a biker about 500 feet up the road, I just start laying on the horn swerving wildly (inside my lane, to be safe of course). Those bikers slow way down and move as far away from me as they can get which is exactly what I want - often stopping completely and carrying their bike up onto the curb until I go by. I would encourage everyone to do the same in the interest of car/bike saftey. My "close calls" have also dropped way, way off since I started doing this!