I’ve always assumed that drivers cannot or will not see me and I rode accordingly. If a car was ahead of me, for example, I always assumed that it would make a next right, so I wouldn’t be caught off guard when it actually made that right hand turn.
Our local postal carrier almost got me that way a few weeks ago. He came from behind me and I thought he was going to pass me on the left. He did, but then he cut me off by turning right directly in front of me. I slammed on the brakes, avoided the collision, and, um, politely informed him that I thought he should improve his driving.
There were no other vehicles on the road, just my bike and his car. It was broad daylight. He simply did not see me. Drivers get into this car/no car mindset. Cars exist, bikes don't.