I would ride secondary and let the traffic go past me.
Thats my opinion.
It is contrary to what mrpauls ideology prescribes the correct action to be.
My riding dosnt vary that much depending on if theres any debris on the ground to the point that i am paralysed from giving an opinion based on hyperthetical sceenario.
I wont be taking anyone to court for wrong advice.
I would judge it on those things.
If I am going slowly, then I will usually get out of the way, unless it poses a risk to me in any way.
If I am coming to the top of a steep hill, then I will pull over at the top.
If I am going at speed, especially downhill, then I wil gradually pull over, as to avoid skidding.
But if it's in the countryside, the vast majority of drivers hold back until there is more room than absolutely needed.
City driving, I will drive about a meter and a half from the kerb, so I have enough room on case of emergency.
BUT I live in London and 90%of my journey is in bus or cycle lanes, so of you live somewhere without these, I dunno.