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What is the method for judging distance using rearview mirrors?

2 Answers

LeviFitz

09/07/25 2:24am

The method for judging distance using rearview mirrors is: 1. When the car image occupies the entire rearview mirror, the distance is 3m; 2. When the car image occupies two-thirds of the rearview mirror, the distance is 5m; 3. When the car image occupies half of the rearview mirror, the distance is 9m; 4. When the car image occupies one-third of the rearview mirror, the distance is 12m. The adjustment method for rearview mirrors is: 1. Left rearview mirror: Place the horizontal line at the center position of the rearview mirror, then adjust the edge of the car body to occupy one-fourth of the mirror image; 2. Right rearview mirror: Place the horizontal line at two-thirds position of the rearview mirror, then adjust the edge of the car body to occupy one-fourth of the mirror image.

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LaLeonardo

09/18/25 8:41am

Judging the distance through rearview mirrors is a practical skill, and I've summarized some experience from years of driving. The key lies in observing the size and position of the following vehicle in the mirror: if the front of the following car is clearly visible and occupies most of the mirror surface, it indicates it's very close, possibly just a few meters away; if it appears smaller and blurrier, that means there's still some distance. The side rearview mirror is crucial—when the body of the following car is just blocked by the mirror frame, the distance is usually around 5-8 meters, which is suitable for judging lane change safety. I always recommend adjusting the mirror angle: sit upright in the driver's seat, with a small part of your own car body visible at the edge of the mirror, as this minimizes blind spots. At night, the brightness of the following car's lights can also help estimate distance changes. Practice more in low-speed areas, and you'll quickly develop the habit. Remember not to rely solely on rearview mirrors—glance over your shoulder to check blind spots while driving to ensure safety. This method is simple and efficient, making driving more confident.

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