How many centimeters is the maximum allowable deviation for straight-line driving?
2 Answers
Straight-line driving should not deviate more than 30 centimeters to either side. The assessment requirements for straight-line driving are as follows: Requirement 1: The driver must start smoothly and maintain a basic sequence of driving operations. Requirement 2: The driver must correctly handle the steering wheel (primarily using the left hand) and utilize the steering wheel's free play to adjust the driving direction. Requirement 3: The driver must master the timing and methods of gear shifting, being adept at switching between high and low gears at various speeds (including sequential upshifting, sequential downshifting, or skip downshifting). Requirement 4: The driver must be capable of timely and effective use of the brake (anticipatory braking for deceleration).
When I was taking my driving test, the straight-line driving section was my nightmare. The instructor in the car kept an eye on me, saying the vehicle couldn’t deviate more than 30 centimeters from the centerline of the lane, or I’d fail the test immediately. I remember being so nervous during practice that my palms were sweaty—I had to focus on the distance ahead and keep both hands steady on the wheel, as even a slight tremor could cause a drift. The standard lane width is about 3 meters, with the centerline as the reference. A 30-centimeter deviation could mean crossing the edge line or entering the opposite lane. Once during a simulation, I drifted 40 centimeters, and the system beeped—my heart sank. Thankfully, I passed later by practicing fine-tuning techniques. Now, even on the highway, I subconsciously remind myself of that limit—staying within 30 centimeters helps avoid collisions. Safety comes first. Though strict, this rule is a lifesaver for beginners.
