What does a single broken yellow line indicate?

A single broken yellow line indicates that passing is allowed when it is safe to do so. This line serves as a guideline for drivers, signaling that they may cross into the oncoming lane to overtake another vehicle, provided that there is no oncoming traffic and it's safe to make the maneuver. It is a warning to exercise caution and ensure that the roadway is clear before attempting to pass.

In contrast, solid yellow lines would indicate that passing is prohibited, while lines that are not broken do not permit any crossing for the purpose of passing. Therefore, recognizing the meaning of a single broken yellow line is crucial for maintaining proper driving practices and ensuring road safety.