What does the sawtooth line on the highway mean?

[MarleyMarie]

Highway sawtooth lines are called longitudinal deceleration markings. Below are the specific details about sawtooth lines:1. Function: The longitudinal deceleration markings for traffic lanes consist of a series of diamond-shaped dashed lines parallel to the lane dividing lines. Their main purpose is to create a visual narrowing effect on the lane, inducing a sense of pressure, which prompts drivers to automatically slow down at locations requiring deceleration, such as curves and slopes.2. Principle: When vehicles pass through sections with longitudinal deceleration markings, drivers' subjective vision perceives the lane as gradually narrowing, prompting them to take deceleration measures and proceed slowly. This effectively prevents drivers from slamming on the brakes just before the stop line.3. Occurrence and forms: Generally, highway sawtooth deceleration markings are placed at locations like bridge undersides, toll plaza areas, ramp entrances and exits, turns, and slopes. They mainly appear in forms of single dashed lines, double dashed lines, or triple dashed lines.