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How to Judge the Distance Between Cars Using Rearview Mirrors?

2 Answers

DiGrant

07/29/25 1:19am

When a car behind is driving in the left rearview mirror, if the car occupies the entire left mirror, the distance is 1.2 meters. If the car occupies half of the left mirror, the distance is 4.6 meters. If the car occupies only one-third of the left mirror, the distance is 9.2 meters. When a car behind is driving in the right rearview mirror, if the car occupies the entire right mirror, the distance is 2.3 meters. If the car occupies half of the right mirror, the distance is 8.5 meters. If the car occupies only one-third of the right mirror, the distance is 15 meters. When an SUV behind is driving in the center rearview mirror, if only the windshield of the rear car is visible, the distance is 16 meters. If the hood of the rear car is visible, the distance is 4.4 meters. If the license plate of the rear car is visible, the distance is 18 meters. During normal driving when changing lanes, besides judging the distance between the rear car and yourself, it is also necessary to pay attention to whether the rear car is accelerating or if its speed is higher than your driving speed. The turn signal is essential.

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Tom

08/12/25 5:27am

I've been driving for twenty years, and judging distances comes with practice. Using the interior rearview mirror to check the vehicle behind: if the car looks like a small toy, it's far away; if it almost fills the mirror, it's only a few meters away. For the side mirrors: when the car behind disappears from the edge of the mirror, it should immediately appear in your window view, indicating a distance of about five to ten meters. Speed has a big impact: at high speeds, the distance shortens quickly, so always double-check before changing lanes. Adjusting the mirrors is crucial—sit upright and position the mirrors so that just a bit of your own car is visible at the edges to reduce blind spots. Beginners can practice on empty roads by having someone drive behind them to judge and verify distances. In a month or two, you’ll get the hang of it and avoid minor collisions.

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