Imagine a car load of teenagers driving down the road at night. If you are on that road on your bike you are dependent on the driver of that vehicle going through five complex steps of "seeing" in order to avoid hitting you. Those steps are:
1) Scanning and searching (requires constant attention both forward and to the sides);
2) Detection (requires focus on the object detected - that would be you!);
3) Evaluation (requires recognition and judgement);
4) Decision (requires the driver to think about what they see and what to do about it);
5) Action (applying the brakes, changing lanes, etc. to avoid a crash).
The problem with all of this is demonstrated in the following drawings:
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