Many years ago, more than I care to remember, I took a one day course at Portland International Race Way on how to drive fast and safe. The first instruction given by the instructor was on how to adjust the rear view mirrors on what was going to be my vintage racer an XKE Roadster. He allowed that the majority of crashes on the track were caused by drivers who failed to see the other guy coming from behind on either the right or left.

1. Dash or windshield mirror adjust to dead center rear view.

2. Side mirrors adjust so that with just a slight turn of the head to the left or right you should not see any part of the rear of your car. If you can see just a bit of of your rear fender nudge the mirror outward so it just disappears.

The good driver will regularly glance at the center mirror to check following traffic, and if you want/need to change lanes check side views. If there is something there stay put.

This works even on my 04 Graphite Metalic

Still driving fast and accident free 32 years later.