What does the sawtooth line on the highway mean?
2 Answers
Highway sawtooth lines are called longitudinal deceleration markings. The longitudinal deceleration markings for the carriageway consist of a set of diamond-shaped dashed lines parallel to the carriageway dividing line. Here are the details: Location and function of longitudinal deceleration markings: Longitudinal deceleration markings are usually set at bridge approaches and turns. Their main function is to create a sense of compression by visually narrowing the lane, prompting drivers to automatically decelerate at locations requiring speed reduction, such as curves and slopes. Common deceleration markings: Deceleration markings are divided into transverse deceleration markings and longitudinal deceleration markings. Transverse deceleration markings for the carriageway consist of a set of parallel white dashed lines, while longitudinal deceleration markings for the carriageway consist of a set of diamond-shaped dashed lines parallel to the carriageway dividing line.
I've always believed that the zigzag lines on highways are particularly crucial—they serve as silent yet vital reminders for road safety. Every time I drive on the highway and spot these wavy lines, I know there’s likely a hazard ahead requiring reduced speed, such as sharp curves, construction zones, or near exit ramps. The jagged design visually grabs attention, prompting drivers to slow down instinctively. Once during a night drive on a slippery road, the sudden appearance of these lines made me hit the brakes just in time to avoid entering a temporary road closure. That experience deepened my understanding of their purpose: they aren’t randomly painted but are carefully placed preventive measures by traffic authorities to reduce accident rates. I recommend all drivers develop the habit of noticing road markings, combining them with rearview mirrors and speedometers to maintain safe distances and steady speeds. In essence, these small details are part of driving wisdom—overlooking them could spell trouble.
