What are the simplest methods to determine a 30 cm margin?

[AaronRose]

There are three commonly used methods to determine if the distance is within 30 cm: 1. Align the front one-third of the car with the right-side line and proceed forward: Generally, the car is divided into three equal parts, and the right one-third of the front is aligned with the right-side line to proceed forward. When first practicing driving, learners often struggle to find this one-third point. Some instructors may advise using the "coach car" text on the hood, aligning the word "coach" with the side line visually. 2. Align the highest point of the wiper with the right-side line and proceed forward: Observe the wiper and align its highest point with the side line to proceed forward. Another less commonly used but easy-to-find reference point is aligning the gap in the wiper with the side line. This method can also be used for stopping within 30 cm in the driving test's roadside parking exercise. 3. Align the right-side reinforcement rib with the side line and proceed forward: Aligning the right-side reinforcement rib with the side line is also a frequently used method.

[JessicaLynn]

When I usually pull over, the simplest method is to look at the right-side rearview mirror: when the roadside line just disappears at the edge of the mirror, the wheels are about 30 cm away from the curb. I often use this method myself, and it's quite accurate and not complicated to execute. Another tip is to use the wiper position as a reference—for example, aligning a certain raised point on the hood with the roadside helps quickly gauge the distance, but you need to mark the spot on your car in advance. Remembering the wheel position is also crucial: looking out the window at the front wheel, just align the edge line with the center point of the wheel hub. These methods save time and help avoid scraping the curb. Practicing once or twice makes it second nature. I’ve shared similar tips with friends, and they’ve said parking has become super easy. To ensure safety, I usually practice distance perception in open areas, so sudden roadside stops don’t fluster me, and driving feels more stable. After all, 30 cm is the standard pulling-over distance, and mastering it can save a lot on repair costs.

[VonWyatt]

As a frequent driver, I always use simple tricks for parallel parking. The main method is using the interior rearview mirror: adjust the angle so that the roadside line aligns with the inner edge of the mirror frame, which gives a distance of about 30 centimeters. Another common method involves using the window line—after sitting down, align the right door pillar or a marked point on the car frame with the roadside for an easy visual estimate. I find this the easiest for beginners and recommend practicing a few times in an open area first, so you don’t rely on instruments during actual operation. Sometimes, I also observe the car’s tilt angle—if the hood is parallel to the roadside, you can steadily approach by moving slowly. These techniques avoid high-tech tools, relying purely on manual judgment, but they’re highly reliable. Remember, mastering them boosts driving confidence and reduces accidental scrapes.

[ElisaDella]

I've developed efficient methods through driving practice. The simplest involves using wheel positions: when turning the steering wheel right, glance outside and stop when the front wheel center aligns with the curb - that's exactly 30cm. Alternatively, use the wiper node as a fixed reference point. These methods eliminate complex calculations and can be effortlessly applied during daily driving, saving both time and energy. Through repeated attempts, I've found they create muscle memory - now I can parallel park perfectly every time, eliminating parking headaches altogether.

[MacMakayla]

When judging the 30 cm distance on the roadside, I rely most on intuitive methods. For example, the vanishing point of the right rearview mirror: when the edge of the roadside mirror disappears from view, brake—the distance is just right. Another method is the window view—after adjusting the seat, find a reference point on the door pillar to align with the roadside line. Beginners may need to practice this a few times to get it precise. I recommend using a ruler to measure and familiarize yourself with the feeling when parking initially. Once mastered, parking becomes smooth and safe, avoiding scraping the curb and damaging the tires.