Heh, I'm a great driver, but I have had moments where I missed my exit without realizing it and suddenly find myself driving through a tunnel thinking "Hey, this tunnel wasn't supposed to be here.".
But even when that happens, I react and respond to everything I need to. Also if I see a car and a minute later someone asks me what color it was, I'm like, what? I just register the important things I need to know. Dimensions, speed, etc. I see everything I need to know, but not much more than that.