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What is the formula for judging the distance of a car in the right rearview mirror?

2 Answers

GageAnn

07/29/25 5:15am

The smaller the car, the safer it is; when the rear car occupies 1/3 of the mirror, the distance between the two cars is 10 meters; when the rear car occupies 1/2 of the mirror, the distance is 7 meters; turning is possible in both cases. Below is some relevant information about rearview mirrors: 1. Introduction to rearview mirrors: A rearview mirror is a tool that allows the driver, while seated in the driver's seat, to directly obtain information about the rear, side, and lower parts of the car. For the convenience of the driver's operation, to prevent traffic safety accidents, and to ensure personal safety, all countries mandate that cars must be equipped with rearview mirrors, and all rearview mirrors must be adjustable in direction. 2. Installation of rearview mirrors: When designing rearview mirrors, the main design considerations include the field of view (indirect vision) that the rearview mirror can capture, image distortion, image clarity, image size, the position of the image in the rearview mirror, etc., making it easy to adjust according to changes in the driver's viewpoint. Rearview mirrors should be installed in the position on the car body where vertical vibration is minimal.

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MacNevaeh

08/12/25 8:52am

When I first learned to drive, I was taught a simple rhyme to estimate the distance of a car in the right rearview mirror: when the car behind occupies half the width of the mirror, it’s about 10 meters away; when it takes up one-third of the width, it’s around 15 meters; and if only a corner of the car is visible, covering a quarter of the mirror’s width, then the car is over 20 meters away. This rhyme has helped me for years, especially before changing lanes on the highway—it quickly helps me gauge a safe distance to avoid rear-end collisions. Of course, don’t rely solely on it; you need to factor in your speed—increase the safe distance when driving faster. I’ve made it a habit to mentally recite this while checking the mirror, and with practice, it became second nature. Remember, adjust your rearview mirror correctly—misalignment can skew your judgment. Safe driving is built on these small details.

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