A driver paying full attention will still have that attention divided among several tasks. He should be monitoring what is happening behind the car. He should be checking the instrument panel. Even looking forward has subtasks. His forward scan should spend some time on things nearby, and some time looking far down the road.
get back to me after you've been driving every day for ten years and we will see what your interpretation of "full attention"means. you can't be 100% vigilante 100% of the time.
Probably what you're not experiencing 100% of the time. You have plenty of examples of cars being bad, but I'm sure you also have examples of cars not being bad. Of not trying to hit you and of giving you a wide berth when you're riding your bike.
But on the note of your bike, full attention includes things other than you. It includes the opposite lane, the speed limit, people behind them that might not stop if he hits his brakes and so on.
As a side note, there's a lot of sharp emotions directed at what people are saying and the verbage people are choosing is, I think, unnecessarily harsh and in some cases mocking. We need to tone that back.
