What Do the Sawtooth Lines on Highways Mean?

[AngeloFitz]

Highway sawtooth lines are called longitudinal deceleration markings. Here are the details about their meaning: 1. Introduction: Longitudinal deceleration markings consist of a series of diamond-shaped dashed lines parallel to the lane demarcation lines. They are usually installed at bridge approaches and curves. The primary function of these sawtooth lines is to create a visual narrowing effect on the lane, inducing a sense of pressure, prompting drivers to automatically reduce speed at locations requiring deceleration such as curves and slopes. 2. Principle: When a vehicle passes through a section with longitudinal deceleration markings, the driver's subjective vision perceives the lane as gradually narrowing, prompting them to actively reduce speed and proceed cautiously. This effectively prevents drivers from slamming on the brakes abruptly when approaching a stop line.