A guy pulled out in front of me a year ago (in my car) on the way to work. I was blinded by the sun and some stubborn frost on the windshield. A little knoll in the road sealed the deal. I rammed into him as he gradually accelerated. I was going 45, he was going 15.
Anyway, I still feel that anytime my eyes are not directly on the road, that I am going to look back and there will be a car, truck, person, animal there. Unfortunately, these events take a while to clear our minds.