Sometimes when I am driving and waiting to enter traffic from a side street with limited view of oncoming traffic, and with an impatient driver behind me, I choose not to enter the road when I see a one-car sized gap in oncoming traffic because I have a serious suspicion that Mr or Ms Impatience behind me will pull out into the traffic right behind me on the basis of my evaluation that it is safe for me i.e. safe for one car to enter traffic, rather than stopping to evaluate the safety margin for themselves, i.e. two cars fitting into a one-car gap.

This brings back-seat driving to a whole new level. I suggest that you concentrate on driving your own car, Helen, and leave the other people to drive theirs.

DC