
Methods to see the 30 cm right side line without a wiper include: 1. Method One: Look at the Hood: The test site has side lines. From the driver's seat, if the right one-third of the hood aligns with the right side line, the car is about 30 cm away from the right side line. 2. Method Two: Look at the Wiper: From the driver's seat, when the raised part of the left wiper aligns with the right side line on the ground, the car is approximately 30 cm away from the right side line. If unsure, you can also confirm through the right rearview mirror to find the precise point. 3. Method Three: Look at the Right Rearview Mirror: Observe the front door handle in the right rearview mirror. When it is tangent to the right side line, the distance between the car body and the right side of the road is about 30 cm.

As a veteran taxi driver with over 20 years of experience, I always rely on familiarizing myself with vehicle dimensions to solve this problem. Without windshield wipers as a reference, I use the right-side body lines or window frames as new reference points; when parking by the curb, I reverse slowly and carefully observe the position of the curb line in the rearview mirror—30 centimeters usually corresponds to the lower half of the mirror. Practice in an open area by placing a cardboard box to simulate the curb line, adjusting repeatedly until you develop a sense of distance. Road safety cannot be overlooked; beginners tend to panic, so I recommend setting aside ten minutes each week to practice—experience will naturally turn it into a habit. Vehicle differences are significant, and the perspective changes when the seat is raised, so it's better to observe after fixing the seat position. Remember, don't rush to get it right all at once—safety comes first.

As a new driver who just got my license, this issue used to give me a headache. When the wipers are gone, I learned a practical trick: slow down and pull over, use your phone to take a photo or get out to check the distance directly. Although it's a bit troublesome, it's reliable. Most modern cars come with rearview cameras or radar systems, installing one can display the distance in centimeters in real-time, or even DIY a cheap sensor will do. In the initial stage, don't be afraid of being laughed at, moving slowly is key; safety first, practice a few times in an open area of the community and you'll get the hang of it. I also found that adjusting the rearview mirror angle helps, the roadside line reflected in it will appear narrow when it's 30 centimeters away. Additional tip: be extra careful when the road is slippery in rainy weather, adding an anti-slip mat can assist in observation.

From a teaching perspective, the key lies in establishing new reference points. I recommend using the right side mirror as a benchmark, slowly approaching the curb to observe the line position; practice repeatedly in parking lots, setting 30-centimeter markers such as tape or small poles to gradually familiarize yourself with the distance. Maintain straight vehicle movement and use the side mirrors and intuition to judge. Expand safety considerations: avoid focusing only on one side, scan the environment comprehensively. Persist with a few days of practice, and your visual judgment will improve.


