[Afordman31]

If it is like my Pickup, when someone is following you at night and their headlights shine in your back window, it puts a glare all the way across you windshield. The only spot that you can see without the glare is where your head is positioned looking out the windshield.
Have often thought that is why Henry produced the slant windshield. My thought on this subject.

Not copying what Mitch said, I was typing at the sametime. He and I have the same thoughts.