A few days ago, a tip on how to judge the distance of the car through the exterior rearview mirror appeared on the Internet, mainly based on the size ratio of the rear car in the exterior rearview mirror of the car. So, is this method accurate, and is it also applicable to the “big view” rearview mirror that many consumers like to use today? To this end, the editor personally experienced it for car owners to learn from.
The tricks don’t all match
According to the tips mentioned on the Internet, as a driving vehicle, if the image presented by the rear car in the exterior rearview mirror accounts for almost all of the exterior rearview mirror, then the distance between the rear car and the car is about 3 meters; If the rear car accounts for two-thirds in the exterior mirror, the distance between the two cars is about 5 meters; If it accounts for one-half, then the distance between the two cars is about 9 meters; If it accounts for one-third, it is about 12 meters.
The author found that this trick used the effect measured by ordinary rearview mirrors in the test. However, at present, there are two main types of mirror mirrors, one is a flat mirror, which can obtain images of the same size as the eye; The other is a convex mirror, the mirror surface is spherical, its image is smaller than the eye, but the field of view is large, that is, we commonly known as the “large field of view”.
In order to reduce blind spots and expand the field of vision, most domestic owners are very fond of “large vision” rearview mirrors, even if there is no standard equipment on the car, they will buy and install it themselves, so in the “eyes” of the “big vision”, can you see the same effect as in the trick?
In the case of 3 meters between the two cars, the rear car image in the ordinary rearview mirror basically accounts for all of the rearview mirror of the front car; And in the “big view”, the rear car does not account for all, accounting for a slightly more than half of the proportion.
In the case of 5 meters between the two cars, the image of the rear car in the ordinary rearview mirror basically accounts for two-thirds of the rearview mirror of the front car; In the “big vision”, it accounts for less than half of the proportion.
In the case of the two cars being 9 meters apart, the image of the rear car in the ordinary rearview mirror can basically reach half of what is said in the trick; But in the “big view”, it accounts for just over a quarter.
This result, for the “large field of view” and ordinary rearview mirrors, whether from the left and right exterior rearview mirrors, the difference is not much. However, as far as the trick is concerned, it is clear that it does not apply to the “big field” rearview mirror.
The large field of view is easily distorted in the judgment of distance
After actual measurement, it is not difficult to find that the distance between the vehicle and ordinary rearview mirrors is nearly half smaller than the actual distance judged by the “large field of view”. This kind of error will leave great safety hazards in actual driving.
An industry insider specializing in car modification said that the “big field” rearview mirror makes the owner’s vision wider and more objects behind him can be observed. However, while blindly pursuing a wide field of view, the image presented in the rearview mirror is smaller than the actual size seen. As the author found in the actual test, if the rear car is full in the front exterior rearview mirror of the “big view”, then there is basically no distance between the two cars, and in the actual parallel, this situation is very easy to cause the two cars to scratch or even collide.
Therefore, the person said that because the judgment of distance will be seriously distorted, the owner who chooses the “large field of view” rearview mirror should leave enough space for vehicle operation during the actual driving process to avoid danger.
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