Why does the car run over the edge line during a 90-degree turn?

[OMichael]

A 90-degree turn running over the edge line is generally caused by steering or speed issues. For example, there are two main reasons for running over the line during a left 90-degree turn: one is turning the steering wheel too quickly, and the other is driving too slowly. Running over the line during a right 90-degree turn is usually caused by turning the steering wheel too late or driving too fast. Below are some tips for executing a 90-degree turn: 1. Pay attention to distance: The driving technique for a 90-degree turn is to keep the rear of the car close to the right side, maintaining a distance of about 30~40 cm from the right edge line after entering the turn. This is the standard safe distance, providing more room for adjustment in case of driver error. 2. Watch for reference points: When the first vertical bar on the left window aligns with the corner, turn the steering wheel fully to the left. Keep the right side of the car close to the outer edge line, and when the middle of the triangular window on the left and right front doors aligns with the inner and outer edge lines, turn the steering wheel fully left or right. Straighten the wheel when the car is aligned.

[Madeleine]

As a veteran driver who frequently navigates urban-rural fringe areas, I know all too well about the issue of cutting corners during right-angle turns. When the vehicle is too far outside while turning, the front wheels are especially prone to scraping against the curb. The key is to start steering inward half a meter in advance, keeping the vehicle close to the apex of the turn. Remember to monitor the rear wheels in the mirrors—many beginners focus solely on the front end and end up sweeping the line with the rear. Also, if the vehicle isn't properly aligned, control becomes even trickier. For example, before making a right turn, you should first veer slightly left to create turning space. Last time I was delivering goods in a small truck through narrow village alleys, I came within a finger's width of scraping the wall—all because I adjusted the angle in advance.

[EthanRose]

The driving school instructor repeatedly emphasized the importance of leaving a safe distance when making 90-degree turns. Many people fail the Subject 2 test because they don't properly handle the relationship between turning radius and steering timing. It's recommended to keep the speed below 10 km/h to allow time for minor steering adjustments. Especially for vehicles with thick A-pillars, extra caution is needed for blind spots—stretch your neck to check the curb before turning. Hitting the line in the test area results in an instant 100-point deduction, a painful lesson learned through bitter experience. When training students, I make them silently recite the mantra 'full lock when passing the reference point'.

[NaomiRose]

A common issue during car repairs is scraped right-side tire walls, mostly caused by turning too close to curbs. If you turn the steering wheel too late, the rims can easily scrape against the curb. You should turn using the inner wheel as the pivot point, like drawing a circle with a compass. Extra caution is needed with long-wheelbase vehicles, as their larger turning radius increases the risk of misjudgment. When navigating narrow roads in my older sedan, I often roll down the window to listen for tire friction sounds as a warning.

[DelVanessa]

Cutting the line during a right-angle turn mainly comes down to anticipation. You need to plan the tire trajectory before entering the turn. Steering technique also matters—quick full lock for tight left turns, but slower steering for wide right turns. Maintain at least half a meter of safe distance between the car body and the corner apex, and only start straightening the wheel when you see the rear wheels pass the turning point in the rearview mirror. I used this exact technique to make a U-turn on a two-lane road while helping my neighbor move his car.

[DiIker]

I have personal experience with crossing lines during turns – ruined three tires as a novice. Later realized steering wheel and tires dance like ballroom partners: turning slightly early makes wheels cut inward, slightly late causes outward drift over lines. Remember for sharp turns, slow to a near-stop speed for stability. Driving SUVs through 90-degree community turns, I always wait until the hood covers the curb before steering – that's the sweet spot.