How Far Should the Distance Be in the Rearview Mirror to Change Lanes?

[HazelFitz]

You can change lanes when the distance in the rearview mirror is less than 9 meters. Judging the distance to the car in front during traffic jams: A following distance of about 2 meters is generally appropriate. Being too close can easily cause a rear-end collision, while being too far may allow other vehicles to cut in. Under normal circumstances, the distance can be judged based on the position of the rear bumper and tires of the car in front as seen from the contour line of your car's front: seeing the upper edge of the rear bumper—distance is 1m; seeing the lower edge of the rear bumper—distance is 2m; seeing the lower edge of the rear tires—distance is 3m. Judging the distance to the stop line when leading: When you can see the stop line aligned with the 5 cm point of the front door corner through the car window, your car is aligned with the stop line.