My experiences on this journey have made this issue a whole new interest for me. I work in a safety critical role, safety per se is already in the front of my mind, so seeing the issues in a different situation is very interesting.
Twenty days, 1,455 miles, and the return home starting tomorrow is a huge data resource now, and a very concentrated window on road behaviour in different situations. Almost all that distance is on camera at 2fps, mostly forward facing from the handlebar mount, some rear facing and some forward facing from the front offside trailer corner.
My second camera arrived this morning, so the return trip will be filmed both forward and rear facing. When I get home, I will be looking for a means of creating split screen clips of my footage to show both ways at once. Might need a new PC!
The driver behaviour on the worst roads has patterns to it, so with the right interventions at the right level, which I don't feel are necessarily individual prosecutions, I believe there are ways to make the improvements needed.
A friend told me about a visit to France, and mentioned that even on dual carriageways, drivers were being really careful around cyclists. Apparently the presumption of blame approach is now in force there, and seems to make a difference.