What does a solid double yellow line in the center of the road signify?

A solid double yellow line in the center of the road signifies that no passing is allowed in either direction. This marking is used to indicate that the road is potentially dangerous for passing maneuvers, often due to limited visibility, curves, or other safety concerns. Drivers should adhere to this rule to maintain safety for all road users, as attempting to pass may lead to head-on collisions or other accidents.

The other options misinterpret the meaning of the double line. For instance, suggesting passing is allowed in either direction contradicts the safety intent of the marking. Passing only on the right does not apply as the restriction applies to all passing. Similarly, indicating a one-way street is unrelated to the purpose of the double yellow line. Understanding these rules helps uphold safety regulations and encourages responsible driving practices.