What does a double yellow line mean on the road?

A double yellow line on the road indicates that no overtaking or passing is allowed. This marking is used to enhance safety in areas where visibility may be limited or where passing could create hazardous situations, such as curves, hills, or pedestrian-heavy zones. It serves as a clear communication to drivers that they should not cross the line to pass another vehicle, emphasizing the importance of maintaining safe driving practices and adhering to traffic regulations. This helps to prevent potential accidents and promotes smoother traffic flow in critical areas.

The other options do not accurately reflect the meaning of double yellow lines: overtaking under specific conditions, parking restrictions, or U-turn permissions are governed by different road signs or signals, not by the presence of double yellow lines.