What is the appropriate downward angle for the right rearview mirror?

[AndersonLynn]

The right rearview mirror should be angled downward by 90 degrees. For the exterior rearview mirror, the horizontal line where the sky meets the ground should be positioned at the upper one-third of the mirror. This means two-thirds of the mirror should show the ground, and one-third should show the sky, which is the optimal position for vertical adjustment. When adjusting horizontally, ensure that the car body is visible in the exterior rearview mirror, but not too much—just enough to monitor the area around the vehicle. For the interior rearview mirror, it's best to have the entire following car visible when there is one behind you. The most important aspect is to maintain a clear view of the ground. If possible, replacing the interior rearview mirror with a convex mirror is ideal, as it provides a much wider field of view, allowing for a comprehensive understanding of the situation behind the vehicle. Additionally, avoid placing large items near the rear window, as they can obstruct the view from the interior rearview mirror.