Why does the system report lane crossing when I didn't actually cross the line in Subject 3 test?

[BellaDella]

If there is indeed a misjudgment, you can explain it to the instructor and the examiner on the spot. The test center has surveillance video that can be reviewed. Relevant explanations are as follows: 1. Do not ride on dashed lines: It is strictly prohibited to ride on road dividing lines. Even dashed lines are considered lane crossing. Driving while riding on lane dividing lines for an extended period will result in an immediate 100-point deduction. 2. Reasonable speed: In the Subject 3 test, you must also avoid riding on solid center lines or solid edge lines of the lane. Many trainees deliberately slow down due to concerns about not driving in a straight line, which is not advisable. This may actually increase the likelihood of the vehicle's trajectory deviating, so you should maintain a reasonable and steady speed.

[StHope]

I just took the third driving test last month. During the straight-line driving section, even though I checked the rearview mirror and the wheels weren’t touching the line, the system suddenly announced that I had crossed the line. My heart skipped a beat, and I thought I had failed. Later, when I discussed it with my instructor, he said the exam system uses GPS and sensors with ridiculously high sensitivity—just a few centimeters off the line could trigger a false alarm, possibly due to aging equipment or GPS drift. He suggested practicing with reference points on the car body, like aligning the windshield and rearview mirror with the lines, to stay centered and avoid getting too close to the edge. If it happens during the test, don’t stop—keep driving and file a complaint with the examiner afterward to review the footage. Environmental factors like strong glare can also affect judgment, so it’s best to practice during overcast conditions to get used to it.

[OAshlyn]

During the driving test (Subject 3), encountering false alarms about crossing lines is something I've seen a lot as a frequent visitor to driving schools. Students often complain that they don't feel they crossed the line, but the system beeps. This is because the line-crossing detection is strictly defined—even a slight touch of the tire on the edge of the line counts as a violation, and there are blind spots in the line of sight. Factors like poorly calibrated cameras or strong winds causing the car to shake can easily lead to misjudgments. I always emphasize practicing slow-speed steering control, anticipating the route before turning, and not waiting for the system's voice prompt to react. When a false alarm occurs, take a deep breath, steady the steering wheel, and don't let it affect the subsequent test items. After the test, provide feedback promptly. Strengthening basic training, such as reverse parking, can improve spatial awareness and prevent minor mistakes from escalating.

[OwenAnn]

I had a similar issue during my driving test (Subject 3). I was convinced my wheels weren't crossing the line, but the system reported otherwise. During the post-test review, my instructor explained that the system responds quickly and can detect even minor deviations, like a slight delay in steering. From inside the car, human vision has limitations in fully observing tire positioning. The solution is to develop habits during practice: frequently check side mirrors to confirm wheel tracks, and execute movements precisely without rushing. If there's a false alarm, stay calm and continue driving, then record details for later review. False judgments occur more frequently in low light or on dirty road surfaces, so daytime practice is ideal. This experience made me pay more attention to detail control, which helped me pass the retest.