What causes the rear wheel to cross the line in an S-curve?

[MacLuna]

It may be due to the vehicle body leaning too far to the right during the turn. Below is relevant information about the driver's license test: 1. Introduction: The driver's license test is a qualification examination organized by the Vehicle Management Office of the Public Security Bureau. Only by passing the driver's license test can one obtain a driver's license and legally operate a motor vehicle. 2. Content: The motor vehicle driver's test consists of three parts: the road traffic safety laws, regulations, and related knowledge test (also known as the "theoretical test," referred to as "Subject 1"), the field driving skills test (commonly known as the "pole test," referred to as "Subject 2"), and the road driving skills and safe civilized driving common sense test (commonly known as the "road test," referred to as "Subject 3"). The test content and passing standards are uniform nationwide, with corresponding test items specified according to different types of vehicles eligible for driving.

[LeAthena]

The most dreaded part of the Subject 2 driving test is hitting the lines in the S-curve. Just this week, I got scolded by the instructor several times at the training ground. Realized that rear wheel line crossing is mainly due to steering too late, especially when exiting the curve—I always greedily try to go a couple more steps forward. Speed control is also crucial; last time, my leg pressing the clutch was shaking, and the car didn’t go straight. When the seat is adjusted too far forward, the steering wheel blocks the view, making it extra hard to check the rearview mirrors. Another detail is the entry angle into the curve. The instructor said to straighten the wheel decisively, but I always want to make minor adjustments, causing the rear wheels to swing out. Now, every time I take a curve, I grit my teeth, count to three silently before steering, and finally, the yellow line disappears from the rearview mirror.

[EloiseAnn]

Teaching students to practice S-curves for ten years, 90% of the time hitting the line is a vision problem. Beginners always stare at the front of the car, guessing the position of the rear wheels. Teaching them to observe the parallel relationship between the left door handle and the ground line is particularly effective, but many kids hesitate too much when turning the steering wheel. The degree of steering wheel movement also matters; during the middle part of the curve, you need to keep the direction steady without wobbling. The most frustrating situation is when the car body is too close to the side line when entering the curve, and the tires hit the line before even turning the wheel. Yesterday, a student turned the steering wheel all the way but didn't notice the tire line warning indicator.

[ArabellaLee]

It took me three attempts to figure out the rear wheel alignment thing. The first time, my seat was adjusted too high, and all I could see in the rearview mirror was the car roof. The second time, I turned the steering wheel too early, and the left rear wheel ended up right on the line. The third time, my instructor told me to watch the raised dot on the wiper by the window—when the dot aligns with the outer edge of the curve, it's just right. You have to crawl at a snail's pace to react in time; if you're too fast, there's no chance to correct the steering. Now when I navigate S-curves, I stretch my neck out so far that my whole head is practically out the window checking the rear wheel position.

[LaMiranda]

From the perspective of a driving test examiner, 80% of candidates fail the S-curve due to three common mistakes: entering the curve at an angle less than 40 degrees causing the inner wheel to cross the line, steering wheel handling that's as erratic as a muscle spasm with inconsistent speed, and misidentifying reference points. Some insist on fixating on the hood ornament line, when in reality, reference points vary greatly across different car models. Last week, a girl kept lowering her head to check the front wheel position but completely missed the rear wheel crossing the line. A handy tip: keep a damp towel on the dashboard to quickly wipe off fog from the side mirrors.

[DawsonLee]

A new driver who just got their license tells you that rear wheels hitting the line in S-curves are all due to blind spots. The mirrors on the driving school's Jetta only show the upper half of the tires—you have to lean out desperately to see the whole wheel. The instructor made us memorize the mantra 'enter left, exit right,' but never explained the exact dimensions. Once, I turned the wheel too sharply to the right, and the rear wheel ran over the yellow line right at the curve's apex. Later, I found that using the wiper pivot to locate the curve's center works wonders, but this trick is useless in heavy rain. Every time I navigate a curve, my back is drenched in sweat.