Properly adjusted vehicle mirrors will improve your driving safety because they will help you to see blind spots on either side of your vehicle.
A common crash scenario occurs on a motorist's passenger side because of the difficulty in observing vehicles or objects due to the distance from the driver's seat, the need to twist to the right and look back, and to be able to see around high back car seats.
This two minute video clip shows you the proper way to adjust your mirrors so that you can more easily observe vehicles and objects in your blind spots in a way which may be unfamiliar to you. While proper mirror adjustment does not replace turning your head to make a direct visual, it allows you more advance notice of what's in your blind spots!