I have a noarrow 2 way road near my work. Normally I ride close to the edge and cars always give me plenty of space when passing. If there is a car approching in the opposite direction, and I see in my mirror a car the same distance behind me, I move out into the middle of the lane to stop the car behind from thinking of squeezing through. This has never caused the following cars to get excited.
Near my home there is a short stretch of busy 4 lane road that has a terrible surface. I move to the outside lane for a couple of hundred yards, where the surface is just marginally substandard. This is sometimes problematic for following cars