VIDEO - Chuck Hawks on Setting Your Mirrors
How do you set your outside rear view mirrors? Most drivers set them so that the sides of their vehicle are just visible in the inside edge of the mirror. For forward motion, this is not the most effective view to have. Adjusting them further outward can result in the elimination of blind spots.
If you follow this example, as vehicles move out of sight from the interior rear view mirror, they will appear in the outside mirror giving you a much better idea of what is going on around you using only the mirrors.
This method of adjusting your mirrors does not mean that you no longer have to make shoulder checks and may not be the best view if you are backing into a parking space.