Is driving straight at 30cm from the edge line or a deviation?
2 Answers
Driving straight at 30cm is considered a deviation. Here are the key points to note about driving straight: 1. Smooth start: The driver should start smoothly and maintain a proper sequence of driving operations. 2. Steering wheel: Correctly grasp the steering wheel (mainly operated with the left hand) and use the free play to adjust the driving direction. 3. Gear shifting: Master the timing and method of gear shifting, and be proficient in switching between high and low gears at various speeds (progressive upshifting, progressive downshifting, or skip downshifting). 4. Braking: Apply the brake timely and effectively (anticipatory braking for deceleration).
When discussing the 30cm rule in straight-line driving, many people wonder whether it refers to the safe distance from the lane edge or indicates lane departure. I believe 30cm is typically the standard spacing between the vehicle and the roadside line (such as the shoulder or curb), aimed at avoiding collisions and maintaining a safe buffer. Maintaining 30cm means correct lane positioning without deviation; however, if it decreases below 20cm or increases significantly, it becomes easier to cross the line or lose control, posing a deviation risk. From my driving experience, beginners often estimate this distance using side mirrors—for example, when parallel parking, they rely on ground markings or fixed reference points. Vehicle size affects this value: 30cm suits compact cars, while SUVs may need an extra 5cm. On slippery roads, extra caution is needed as the distance can change rapidly. Developing a habit of checking mirrors before each start can reduce accidents. This isn’t just a skill but also part of safety culture, especially crucial for urban driving.
