The rules i follow,
1 is to treat every other vehicle on the road like its going to try and kill you.
2 On any blind bend assume a big spikey tractor is parked just round the corner unless you can see otherwise. My life was saved by that alone a few years back. I stopped with a couple of inches to spare (i'd shut the throttle on the way in cos of rule 4), face to face with what i think is a gizmo for carrying hay.
3 Look anybody at or on a junction right in the eye, not the stupid tenage i'm harder than you stare your looking for recognition, obvious when you know what to look for.
Finally 4 Trust your insticts.
By no means exhaustive but you have to look after number1 on the roads these days. Even other motorcyclists can be knobbers. I had one try to goad me into racing him, on a very ropey looking retro 550 i think. Wearing.....an england football strip trainers and a cheapo helmet