What does a double solid yellow line mean?

A double solid yellow line indicates that no passing is permitted in either direction. This type of road marking is used to enhance safety by clearly signaling to drivers that they should not attempt to overtake another vehicle on that section of the road. The presence of these lines means that visibility might be limited, or the road conditions could be dangerous for passing, such as on curves or hills.

In contrast, the other options suggest scenarios that are not applicable to double solid yellow lines. For example, passing being permitted from either direction contradicts the primary purpose of the double yellow lines, which is to prevent passing. Yielding to oncoming traffic and allowing traffic to move in both directions also do not accurately describe the implications of a double solid yellow line. These markings serve as a clear warning to maintain safe driving practices and abide by the restrictions they impose.