What do double solid lines mean?

Double solid lines indicate that passing is not allowed in either direction. This rule is in place to enhance safety, particularly in areas where visibility may be limited or where there are potentially hazardous conditions that could arise from vehicles attempting to overtake one another. The use of double solid lines serves as a clear and strong visual cue to drivers that they must remain in their lanes and cannot cross the lines to pass another vehicle.

The other options relate to different traffic regulations. For example, single lines can indicate that passing is allowed with caution under certain conditions, yielding pertains to pedestrian right-of-way laws, and proceeding with caution typically pertains to situations involving road hazards or construction. However, none of these apply to the specific meaning of double solid lines, which is strictly to prohibit passing.