I have tended to have worse moments with cars coming towards me down single lanes.
Janeyb - you were exactly right. Your safety is far more important than the driver's impatience.
Yes the car is probably an inconvenience and I am sure the driver feels the same. When I hear a car coming I move as far to the left as I can, rather than irritate some driver who might run me off the road if I annoy them too much. No harm in pulling as soon as you can, then everyone is happy and no-one is annoyed, simples !!!