What does a solid yellow line mean?

A solid yellow line indicates that passing is not allowed. This road marking traditionally signifies that the side of the road with the solid line is intended for one direction of travel, while the opposing lane may allow passing when it's safe. The solid yellow line acts as a warning to drivers, indicating that visibility could be limited or that passing could pose a danger. It serves as a guideline to promote safety by discouraging maneuvers that could lead to collisions, especially in areas where the road design or conditions make overtaking unsafe. Consequently, motorists should respect this marking and refrain from crossing it to pass another vehicle, ensuring the safety of all road users.