A pilot's flying over a mountainous terrain, and as he's flying, he looks down to see two vehicles driving down the highway.
The first vehicle is a semi-trailer, pulling his load up and down that ol' highway. The second vehicle is a sports car driven by a guy who's got better things to do than be stuck behind a semi that can't always maintain the speed limit up the mountain grades.
Well, what the pilot can see that the drivers can't is that there is no traffic coming the other way. The car could easily pass the truck with no danger.
The problem is that neither the truck nor the car driver can see that. They can
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