You need to develop a Blind-Spot Warning Buzzer in your head. I have one, and everything I do in traffic in a car or on a bike is aimed at keeping this buzzer quiet. When I’m riding as a passenger in a car, this alarm clangs. The worse the driver, the more the buzzer sounds. Closing thought: If you use your horn a lot, if you constantly curse other drivers’ lack of awareness, or if you’re constantly infringed upon by surrounding cars, you are riding in blind spots.