What does the zigzag lane line on highways mean?
2 Answers
Highway zigzag lane lines are a type of speed reduction marking, which can be categorized into transverse markings and longitudinal markings. Their purpose is to create an optical illusion of pressure when vehicles are traveling at high speeds, prompting drivers to instinctively reduce their speed in advance, thereby minimizing traffic accidents. Below is a detailed introduction to highway zigzag lane lines: 1. Speed reduction markings: These can be divided into transverse speed reduction markings and longitudinal speed reduction markings. The longitudinal speed reduction markings consist of a series of diamond-shaped dashed lines parallel to the lane dividers. They are typically installed at bridge approaches and turns. 2. Longitudinal speed reduction markings: These are a set of diamond-shaped dashed lines parallel to the lane dividers. At the starting point of the longitudinal speed reduction markings, a 30-meter transition section is set up, where the diamond-shaped dashed lines gradually widen from 10 cm to 30 cm. This is one of the new markings added in the latest national standard for road traffic markings (GB5768.2-2009).
The first time I drove long-distance, I noticed these zigzag lines. Suddenly, at the toll booth, I saw the white lines on the ground turn wavy, as if chewed by a dog. I immediately realized I needed to slow down in advance. Later, I asked an experienced driver and learned that this is a special visual warning design on highways. The principle is quite clever—when driving fast, these zigzag lines create an illusion that the lane is narrowing, prompting your brain to make you hit the brakes. Now, you often see these markings before sharp turns or service area exits, and even on downhill ramps of urban overpasses. Remember, when you see these wavy lines on the road, don’t hesitate—reduce your speed right away, especially on slippery sections during rainy days.
