When it comes to backing up vehicles I have lousy depth perception and always stop to soon, which is actually a good thing.  One ambulance I use to drive had a light bar mounted in the middle of the back of the box.  As I backed into a hospital I didn’t see the column that was dead center of the box and when I got out I was inches from crushing that light bar.  This situation is why I don’t mind this flaw in me at all.