THE PROBLEM WITH SEEING YOUR OWN CAR
When you can see the side of your car in the mirror, the mirror is pointing at something you already know is there. That wastes part of its view, and it creates a blind spot, an area beside and just behind your car that neither your rearview mirror nor your side mirror covers. A vehicle can sit in that zone without you seeing it, and that is how many lane-change collisions happen.
WHY D WORKS BETTER
In mirror D, the view is angled outward, so it covers the lane next to you. Your rearview mirror shows what is directly behind you, and your side mirrors show what is next to you. The two views overlap only a little, so a car leaving the rearview mirror appears in the side mirror almost immediately. This is often called the Blind Spot and Glare Elimination (BGE) method, and it also reduces the glare from headlights behind you at night.
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