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What is the purpose of the vertical line on the rearview mirror?

2 Answers

SanAlyssa

08/30/25 2:41am

It is mainly used to observe the situation at a relatively far position on the side of the vehicle. Inside the dotted line, the curvature radius is larger, which is used to observe the situation at a relatively close position on the side of the vehicle. The combination of these two curvatures can minimize blind spots in the rearview mirror. Functions of the rearview mirror: The basic function is to expand the driver's field of vision, reduce blind spots, and enhance driving safety. When turning, getting out of the car, or reversing, it is essential to carefully check the rearview mirror. Not looking at the rearview mirror is an extremely dangerous driving behavior. Methods for adjusting the rearview mirror: Adjust the seat and posture to choose a comfortable driving position; adjust the rearview mirror according to the driver's posture, ensuring that the rear door handle is positioned in the middle of the mirror; adjust the internal rearview mirror of the car to ensure that the horizon is centered in the mirror while driving.

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DiNatalie

09/11/25 6:49am

As a veteran driver with 15 years of experience, I'm all too familiar with that vertical line on the rearview mirror. It primarily serves to divide the mirror's field of view: the left side shows a normal view, displaying the accurate distance of vehicles behind, while the right side is an expanded curved area that provides a wider angle, helping me spot vehicles approaching from the side or motorcycles in blind spots. In congested urban areas, I often rely on it to detect electric scooters passing by early, preventing scratches. Once during heavy rain with poor visibility, that line helped me identify a bicycle that nearly collided with me—it literally saved my life. However, don't over-rely on it; objects in the curved area may appear small but could be dangerously close, so make a habit of regularly checking mirror positioning. Overall, this line is a thoughtful design that enhances driving safety, especially in complex city traffic. New drivers should practice observing it more to unlock its full potential, maintaining focus and confidence behind the wheel.

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