For me its you know that your memory knows where its at but you are just failing to recall that specific memory, but for some reason you can pull up all the other memories of where you have seen it before and so you have go looking in all those places to find something to recall it. Another similar thing is when I am using my phone i want to do something go to switch over to it, forget and i will go back to what i was doing before and look for what i was looking at the time when i had the thought and i instantly remember.
My main thoughts instantly come to someone in the opposing left turn lane, if they are not applying the brakes they are likely starting to turn and if they do it right in front of you, you have more of a heads up than just them starting to turn and can set yourself in a better position to hopefully stop in time. Driving is all about judgment calls and having more info quicker is important to those calls.