Impatient drivers who have to wait for 30 seconds or so for a bus to pull away from a bus stop. 400 stopped at the bus stop outside the dentist in Colinton Village just before the corner/bend leading to bridge heading to Gillespie crossroads. I stopped behind it as I was not prepared to overtake on a bend where I couldn't see what was coming. White van man behind me, sounds horn, raises his hands and shakes his head because he had to wait. Then proceeded to tailgate me all the way to the traffic lights at Lanark Road.