What are the white road markings with serrated edges?

[VonLayla]

This white serrated solid line is a variable-direction lane marking. Detailed explanation: Variable-direction lane means that after entering this lane, there are multiple possible lane directions. For example, some intersections allow both right turns and straight-through movements (i.e., right turns and straight-through are combined into one lane), or U-turns and left turns are combined into one lane (usually used for leftmost lanes). Variable-direction lanes offer flexibility, unlike regular lane markings where entering a straight lane means going straight, and a left-turn lane means turning left. Such lanes are generally set up in areas with complex traffic conditions. Additional information: Variable-direction lane markings are primarily designed for sections where traffic is concentrated during peak hours but lanes are insufficient, or where there are significant differences in traffic flow between morning and evening peak periods. When encountering such lanes, simply follow the variable lane indicators. There are time restrictions, meaning you cannot freely choose the direction at any time. Variable lanes are marked by white solid lines with serrated edges.