What do solid yellow lines indicate about passing?

Solid yellow lines indicate that passing is allowed in one direction only. When you see a solid yellow line on your side of the roadway, it signifies that passing other vehicles is prohibited for your direction of travel due to potential hazards or limited visibility ahead. However, if the line on the opposite side of the road is broken, it indicates that vehicles traveling in that direction may pass when it's safe to do so. This system is designed to enhance safety by communicating the conditions under which passing is permitted, making it crucial for drivers to remain aware of the road markings to ensure safe maneuvering.