What is the triangular filled area marking?

[McSamuel]

Triangle filled area is a diversion line, which serves as a lane entrance and exit marking. Below is an extended introduction: 1. Introduction to diversion lines: Diversion lines are white in color and function to guide and divert traffic flow. When connected to the road centerline, they may also be yellow. The marking forms can be divided into three types: single solid line, V-shaped line, and diagonal stripe line. Vehicles at intersections must follow the designated route and are not allowed to drive over or cross the lines. 2. Angle and width settings: The internal filling markings intersect at a 45-degree angle, with the junction generally centered at the road intersection, though actual conditions may vary. Marking width: The outer width is 15 or 20 cm (same as the edge solid line), while the inner width is 40 or 45 cm.