What does the solid white line at an intersection indicate?

[VanJayce]

The solid white line at an intersection indicates a variable lane, reminding drivers of the direction of travel in the variable lane. Below are specific details about the sawtooth lane markings: 1. Appearance: Sawtooth lane markings are a type of speed reduction marking. Speed reduction markings can be divided into horizontal and vertical types, consisting of white dashed lines set up in toll plaza areas, exit ramps, or other sections requiring vehicle deceleration. They come in single, double, or triple dashed lines, perpendicular to the direction of travel. The vertical speed reduction markings for lanes are a series of diamond-shaped dashed lines parallel to the lane dividers. 2. Function: Sawtooth lane markings are typically installed at bridge approaches and turns. Their primary purpose is to create a visual narrowing effect, inducing a sense of pressure that prompts drivers to automatically reduce speed at curves, slopes, or other locations requiring deceleration. Whether lane changes are permitted under speed reduction markings depends on the adjacent line type: solid lines prohibit lane changes, while dashed lines allow them.