What is the method for judging distance with car rearview mirrors?
2 Answers
Methods for judging distance with car rearview mirrors are as follows: 1. When the rear vehicle is within the safe zone of the rearview mirror and positioned towards the right side, it indicates that the rear vehicle is at a relatively large distance from your car, allowing normal turning maneuvers. If the vehicle is already in the center of the rearview mirror, it indicates a distance of approximately 15-20 meters from your car, and turning can still be performed normally. 2. When the rear vehicle's body is close to the boundary between the safe zone and the danger zone, it indicates a distance of about 5 meters from your car. At this point, you should be cautious and signal before turning safely. If the rear vehicle's body has entered the left danger zone of the left rearview mirror, it means the rear vehicle is very close to your car, and turning is not advisable. 3. When the rear vehicle occupies 1/4 of the right rearview mirror and the entire vehicle is visible, the distance is about 25 meters, allowing for turning maneuvers. When the rear vehicle occupies 1/3 of the right rearview mirror, the distance is approximately 15 meters, and turning can be performed. 4. When the rear vehicle occupies half of the right rearview mirror and the entire vehicle is still visible, the distance is about 10 meters, and you can signal before turning. However, if the rear vehicle occupies half of the right rearview mirror but only half of its body is visible, it means the rear vehicle is very close, and turning is not advisable. 5. The interior center rearview mirror can provide a rough estimate of the distance between the rear vehicle and your car. However, since the front height of sedans and SUVs differs, judgment should always be based on actual conditions. When you can see the front wheels of the rear vehicle in the rearview mirror, the distance is about 15-20 meters. When you can see the rear vehicle's grille, the distance is about 6-8 meters. When the grille is just out of view, the distance is about 3 meters.
I remember when I was first learning to drive, I was always nervous about judging distances using the rearview mirror. Mainly, I relied on the size of the following vehicle in the interior mirror: if the car appeared small in the mirror, it meant it was still far away; when it looked huge, I had to be careful because it was already very close. Another trick was using road markings or my own car's taillights as reference points—for example, when the rear car's tires aligned with the white line, the distance was within a safe range. But at first, I often misjudged, like when changing lanes on the highway, thinking the distance was sufficient but almost causing a collision. Later, my driving instructor reminded me to practice estimating distances and reaction times more. Now, driving daily in the city, I habitually glance at the mirror to confirm no one is tailgating before accelerating. This method has helped me avoid many minor accidents during rush hour. Once I got the hang of it, I also started combining the side mirrors for a full view, making driving much easier.
