Research has shown that when we moves our eyes quickly from one side to the other the brain registers it as snap shots which it joins together much like a cine film. It can blot out things that it sees if your eyes move quickly. The other morning I was pulling off the drive I looked left, clear road, looked right clear road, pulled out and I was behind another car ! my brain had completely blotted it out. This is thought to be behind a lot of the "I didn't see it " collisions. The answer is to take more time looking to allow the brain to catch up.
