Maybe it's just the "race memory" of the cars from the early 1900's getting back at cyclists.
In a lot of North American cities early horseless carrages had to yield to everyone. I can't remeber if it was Wisconsin or Minnesota, that any horseless carrage entering a city/town had to have a man with horn precede the car by 50 ft, blowing the horn to announce the presence of this infernal vehicle by day, and a swingin latern by night.