I think it pays to be a bit lairy on the road at times, it gets you noticed and that is what you want ---
To be seen.
Having said that I always wave a following motorist on when I can see the way is clear before he can.
They are usually most surprised and grateful.
As with everything, common sense and give and take.
No need for rules really.
To be lairy - Look dangerous. Swoop about a bit as though you are not quite sure what day it is .