How wide is 30 centimeters in the right rearview mirror?

[DiCora]

30 centimeters in the right rearview mirror's field of view is approximately the width of two fingers. When taking the driving test, here are some tips and methods to determine the 30-centimeter distance in the rearview mirror: Look at the raised part of the wiper: From the driver's seat, when the raised part of the wiper aligns with the right-side line, the distance is approximately 30 centimeters. Look at the one-third point of the car's front: When the one-third point of the car's front (right side) aligns with the right-side line, the distance is exactly 30 centimeters. It might be difficult to locate the one-third point of the car's front (right side), and you may not see the same point every time. During practice, you can mark this point on the car first and remove the mark once you get used to it. Look at the right front door handle: Observe the right front door handle in the right rearview mirror. If the right front door handle is tangent to the right-side line, the distance is just right. If it's too far, you need to make slight adjustments to the direction. If it's too close, there's a risk of crossing the line.