How to Judge the Distance Between Cars Using Rearview Mirrors While Driving?
2 Answers
To judge the distance between cars using rearview mirrors while driving, follow these steps: 1. When the rear car is in the safe zone, located in the center of the rearview mirror, it indicates a distance of 15 to 20 meters from the rear car, allowing for normal turning operations; 2. If the rear car occupies half of the rearview mirror area, with only half of its body visible, the distance is very close, and you should maintain your current lane; 3. When the rear car occupies one-third of the outer rearview mirror area, with the entire car visible, the distance is about 15 meters, and turning operations can be performed; 4. If the rear car's grille is completely obscured, the distance is 3 meters, which is considered a safe distance during slow-speed following.
With 20 years of driving experience, I've developed insights into judging distances using rearview mirrors. During daily commutes, I first observe the proportion of the following vehicle in the mirror: when it occupies only a quarter of the mirror, the distance is approximately over 30 meters, which is quite safe; if it takes up more than half the mirror, the distance is less than 10 meters, and immediate deceleration is necessary to avoid a rear-end collision. On highways, I apply the 2-second rule—select a roadside marker, like a billboard, and count 'one Mississippi, two Mississippi' as the following vehicle passes it. If it takes less time, the distance is too close. During rainy nights with poor visibility, I reduce speed and use hazard lights for assistance. Beginners often misjudge distances, so I recommend practicing on empty roads first: have a partner park at various distances while you adjust the mirror and observe the size changes from inside the car. Maintaining proper following distance saves fuel, reduces braking frequency, and enhances comfort. Regularly clean your rearview mirrors, as dust can impair judgment. Ultimately, safety comes first, and with accumulated experience, it becomes second nature.
