What does the sawtooth pattern on the highway mean?
2 Answers
Highway sawtooth markings are called longitudinal deceleration markings. The following is an introduction to longitudinal deceleration markings: 1. Longitudinal deceleration markings are a group of diamond-shaped dashed lines parallel to the lane dividing line. They are generally set at bridge approaches and turning points. 2. Their main function is to create a sense of compression by visually narrowing the lane, prompting drivers to automatically slow down at curves, slopes, and other locations where deceleration is required. Here is additional information: 1. When a vehicle passes through a section with longitudinal deceleration markings, the driver's subjective vision will perceive the lane as gradually narrowing, prompting them to take deceleration measures and proceed slowly. This can effectively prevent drivers from applying emergency brakes just before the stop line. 2. After entering the sawtooth deceleration markings, drivers must consciously reduce their speed. Typically, electronic surveillance cameras are installed around such markings, and speeding will be immediately captured.
When I first started driving, I was also puzzled by those sawtooth lines on the highway. Later, I asked a friend who works in road administration and learned that they are called longitudinal deceleration markings. They usually appear 500 meters before toll stations, sharp curves, or long downhill sections, designed to create a visual illusion that makes drivers feel the lane suddenly narrows, prompting them to instinctively brake and slow down. Once, while driving at night on the Qinglan Expressway, I encountered these markings. Luckily, I slowed down after seeing the sawtooth lines, otherwise, I might have rear-ended someone on the curve. Remember, never cross these lines to change lanes—it can be caught on camera, resulting in a 3-point deduction and a 200-yuan fine, not to mention the danger of scraping the guardrail. My advice is to slow down to below 80 km/h when you see these sawtooth lines and maintain a safe distance from the car ahead.
