When is it permitted to cross a double solid line?

Crossing a double solid line is prohibited under all circumstances, which is the essence of the correct choice. Double solid lines are established to indicate that the road marking designates a no-passing zone. This means that the intent is to enhance safety by preventing drivers from attempting to overtake other vehicles where visibility may be limited or where it is otherwise unsafe to do so.

Given this context, double solid lines serve as a clear signal to motorists that crossing them poses a significant risk. Therefore, the law mandates that drivers must remain within their lane without attempting to cross these lines at any time. The prohibition exists regardless of the circumstances; even if a driver feels they have a justifiable reason or deem it safe to do so, the law is clear—crossing double solid lines is illegal.