What does the white diagonal line at the U-turn spot mean?

[WillowLee]

The white diagonal line at the U-turn spot is a sign that strictly prohibits U-turns, and driving over the line is even more forbidden. Below are specific details about U-turns for motor vehicles: 1. No U-turns on crosswalks: According to the "Traffic Safety Law," crosswalks (zebra crossings) do not allow motor vehicles to make U-turns. If a U-turn is permitted at an intersection, it should be done after crossing the crosswalk. 2. No U-turns in the leftmost lane if it is a straight-only lane: Generally, near intersections, arrows are painted in each lane to guide motor vehicles in choosing lanes based on their direction of travel. If the leftmost lane has only a straight arrow, even if there is no no-U-turn sign, U-turns are not allowed. 3. U-turns under certain conditions: Vehicles driving on the side with a dashed line are allowed to make U-turns if they do not affect the normal traffic flow of the opposite lane.