A solid double yellow line in the roadway indicates what?

A solid double yellow line in the roadway indicates that passing is prohibited for vehicles traveling in either direction. This marking is a clear visual signal to drivers that it is unsafe to cross the line for the purpose of overtaking another vehicle. The presence of two solid lines reinforces the restriction, emphasizing that the road environment may have hazards, visibility issues, or other safety considerations that make passing unsafe for all vehicles, regardless of their direction of travel. This rule helps maintain safety on the roads by preventing situations that could lead to head-on collisions or other dangerous maneuvers.

Each of the other choices refers to scenarios where passing, lane splitting, or turning is permissible, which contradicts the purpose of the solid double yellow line.