What signifies a no passing zone on the road?

A solid yellow line on your side of the road indicates a no passing zone because it communicates to drivers that it is unsafe to overtake any vehicles on the left. This marking is used in areas where visibility is limited, such as on curves, hills, or near intersections. The yellow color signifies that there is a potential danger in trying to pass, meaning that staying in your lane is essential for safety. This regulation helps prevent accidents by clearly marking where passing maneuvers are not allowed, ensuring that drivers can make informed decisions based on road conditions.

The other options represent different road markings or signs that serve specific purposes, such as indicating lane separations or providing information rather than indicating a no passing zone.