Amesia - I don't like the light flashing and horn blowing either especially when there is a lot of traffic and no where to go but I really get nervous when they get really close to my bumper.  There SO close it's like drafting in NASCAR.  If I just take my foot off the gas they will hit me.  I had 3 young boys in a car the other day do that to me and I was coming up on a speed bump with no where to go because there was a car next to me.  I'm in an SUV and they were in a car and so young. I was actually worried about them hitting me because it would have been far worse for them.  Fortunately the car in front of me sped up so I could move over and let them pass.  I know that if I would have slowed up for the speed bump, they would have hit me for sure.  I kept thinking there mothers would be appalled if they saw them driving like that.