How can a driver legally cross a double yellow line?

A driver may legally cross a double yellow line specifically when making a left turn into or out of a driveway. This maneuver is permitted because it allows access to private property while still adhering to traffic laws designed to maintain safety. The double yellow lines indicate that passing is generally prohibited, primarily due to safety concerns; however, exceptions exist when performing a left turn.

This understanding is crucial for drivers to avoid accidents and ensure they are following traffic regulations. Crossing for other reasons, such as passing another vehicle or making a U-turn, is typically illegal and can lead to traffic violations, as the double yellow lines are intended to prevent potentially dangerous lane changes in high-traffic or high-speed areas.