Which line is used to indicate that passing is allowed when safe?

A broken yellow line is used to indicate that passing is allowed when it is safe to do so. This line serves as a visual cue to drivers that they can cross over it to overtake another vehicle or pass if the surrounding conditions are clear and there is no oncoming traffic. The broken nature of the line signifies that the lane is open for passing, unlike a solid yellow line, which would indicate that passing is not allowed.

This distinction is crucial for maintaining safe driving practices, as passing inappropriately can lead to dangerous situations, particularly on roads where visibility is limited. The other line types—solid yellow, broken white, and solid white—serve different purposes in traffic regulations. Solid lines are generally used to indicate no passing zones, while white lines are typically utilized for lane markings within the same direction, where crossing may be more permissible but does not indicate passing.