Well Adjusted Mirrors could save your life on our busy San Diego freeways!
To adjust your side view and rearview mirrors:
Lean your head over until it almost touches the driver's window, and then position the side mirror on the car's left side so you can just see the rear quarter panel (the rear end of the car) in the mirror. Note this will have it positioned farther out than you probably had it before.
Lean your head to the right to align it with the center of the car, for example, just between the two front seats, at your normal height. From there, position the right side mirror so you can just see the rear quarterpanel of the passenger side in the mirror.
Adjust the center rearview mirror to place it facing the center of the rear window.
While driving note that a car passing you begins in the center of your rearview mirror. As it approaches you, it moves to the side of your center rear view mirror, and at the same time appears in your side mirror. This shows you that there is no rear blind spot, because there is an overlap between the mirrors.
Information courtesy of www.wikihow.com/Set-Rear%E2%80%90View-Mirrors-to-Eliminate-Blind-Spots
Image Source: http://www.caranddriver.com/features/how-to-adjust-your-mirrors-to-avoid-blind-spots