When adjusting your rearview mirror, be sure you can:

Adjust your mirrors so you can see the lane behind you and as much as possible of the lane next to you. When properly adjusted, a mirror may show the edge of your arm or shoulder, but it’s the road behind you and to the side of you that is most important.

• See the lane behind you and the lane next to you.
• See only the lane behind you.
• See only the lane next to you.
• See most of your helmet.