What is the meaning of a double yellow line on the road?

A double yellow line on the road serves as a critical visual cue for drivers that indicates no passing is allowed in either direction. This marking is particularly used on roads where visibility is limited or where it is deemed too dangerous to overtake another vehicle, such as in areas with curves, hills, or heavy traffic.

The use of double yellow lines emphasizes the importance of safety by preventing risky maneuvers that could lead to collisions. Drivers should adhere strictly to this guidance; attempting to pass in such areas can result not only in traffic violations but also in serious accidents.

In contrast, the other options suggest scenarios that are not permitted under this marking. Allowing passing in both directions would undermine the safety purpose of the double yellow line. Similarly, indicating that only right turns are permitted or that U-turns are allowed does not align with the intended traffic controls associated with double yellow lines. These markings specifically convey that drivers should maintain their lane and proceed without crossing these lines for safety reasons.