How to Judge the Distance by Looking at the Rearview Mirror When Changing Lanes?
2 Answers
When the line of sight aligns the raised node of the left wiper with an object on the ground, the left wheel will run over that object while moving. When the line of sight aligns the intersection of the panel and the A-pillar with the center line, the body of the car is exactly 60 centimeters away from the center line. To determine the position of the right wheel, when the line of sight aligns the right wiper with the target, the tire will run over that target.
I've been driving for twenty years, and judging the distance when changing lanes mainly relies on the experience with rearview mirrors. First, adjust the interior rearview mirror to the right position to get an overall view of the traffic behind; then focus on the side mirrors. If the car behind only occupies a small spot in the mirror, like a tiny black box, it means the distance is quite far, probably dozens of meters away, and you can change lanes with confidence. If it looks like it's almost filling the mirror or even appears blurry, then the distance is too close, and you should never rush to turn the steering wheel. I also habitually glance over my shoulder to check the blind spot, making sure no car is hiding there. On highways, especially, pay attention to speed: when driving fast, judge the distance more conservatively, leaving extra space for unexpected situations. Usually, I recommend checking the cleanliness of the rearview mirrors every few weeks—too much dust can obstruct your view. Drive slower in rain or at night, as safety always comes first. Once you master these steps, changing lanes will naturally become smooth and steady.
