How to Determine the Distance of a Car Using Rearview Mirrors?

[CeciliaMarie]

Methods for determining the distance of a car using rearview mirrors are as follows: Rearview mirrors are divided into two zones—a safe zone and a danger zone. The safe zone occupies two-thirds of the right side of the mirror, while the danger zone covers the remaining one-third on the left. When a following vehicle is observed within the safe zone, it indicates the car is at a relatively far distance, allowing for normal driving or lane changes. However, if the following vehicle appears in the danger zone on the left side of the mirror, it signifies the car is very close, and lane changes should be avoided. If the entire body of the following car is visible in the right rearview mirror, it means the vehicle is at a safe distance, enabling turns or lane changes. When the following car occupies half of the right rearview mirror, the distance is approximately ten meters. If only half of the car's body is visible in the mirror, it indicates the vehicles are very close, and the driver should maintain normal driving without changing lanes.