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"I didn't see him!" Why? Fundamental science. We all have a big blank spot in our eyes. We do not see anything directly in front - where the optic nerve leaves the eyeball. In order to see something - well watch a TV drama where two people are up close. To see the other person, eyes flash left and right as if looking into the right eyeball, then left eyeball. That to compensate for a big hole in human vision.
Human must either watch long enough for the eyeball to take two different snapshots of a road, OR human must look down road twice. Either way for the brain to build a complete picture.
"I didn't see him" is what happens when the driver does not practice basic human safety. Again a classic example that there is no such thing as an accident. All are crashes directly traceable to, in this cases, bad human driving practices. It is why cell phone - even hands free type - cause crashes.
Problem: too many humans will even deny this blank spot exists. But that center hole is why a human cannot glance and see everything. That hole is why the human must practice looking twice before acting on what he sees. That hole is why too many humans call it an accident rather than first confront their own bad habits - which include but are not limited to cell phone useage.
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