I hate the blind spot to the left rear not caught be either the inside or side mounted rear view mirrors.I'm feeling that if the outside 1/3rd of my outside rear view was split vertically from what I use normally about 5-10 degrees forward,that area would be covered for that guy that's passing you with his right front bumper about 20 feet from your left rear.I purchased a convex "stick on" to cover the area but the approach vehice is to small to view quickly.Unfortunately accidents happen quickly.