What does a double solid yellow line indicate?

A double solid yellow line indicates that no passing is allowed in either direction. This traffic marking is used to enhance safety by clearly signaling that the roadway is defined as a no-passing zone. The presence of solid lines means that it is illegal and unsafe to change lanes across these lines. This rule is crucial in situations where visibility may be limited or where road conditions are not conducive for passing, such as on curves or hills.

In contrast, other options imply allowances for passing under certain conditions, which goes against the standard interpretation of double solid yellow lines as a clear prohibition. Understanding this marking correctly is essential for maintaining safety on the roadways, as following this rule helps prevent accidents that could occur from unsafe lane changes.