Yes been there and it really affects your cycling.... You know, you loose concentration, bit slow setting off, etcI had a run in with knob driver today in Deptford. Because I was in the right hand lane to turn right at a roundabout he thought that I shouldn't be there. So decided to parp his horn a couple of times. I looked back at him to see him giving the get out of the way type thing. I pointing at him the direction I was going. oh good, he wanted to go my way too. Well more fool him then as there is no room to get by due to the parked traffic. Oh dear... I seemed to have slowed down making his progress.. very.....slow...... cue much revving from the car driver... and childish giggling from me....