I find this thread very instructive, so here goes...
Happened 5 years ago. I am following my wife on a highway off ramp (we both ride
). We have to merge with on-coming trafic on the road to our left but, as we are sweeping down the off ramp, I see that there is only one car on that road and it will be behind us by the time we reach the end of the ramp.
So I keep switching between checking my wife's speed in front and looking over my left shoulder to see where the car is. I do this a few times. Then, as I look in front, I see to my horror that my wife has STOPPED to let the car go by. I swerve to the right and missed hitting her by inches. I nearly stopped riding then and there. My bad, really, you are responsible for the person in front of you.