What is true about crossing solid yellow lines on a highway?

The correct answer emphasizes that solid yellow lines serve as a marker indicating that passing or changing lanes is not permitted, except in certain circumstances. In Hawaii, it is permissible to cross solid yellow lines when making a left turn into or from an alley, private road, or driveway. This rule provides flexibility for drivers to access these locations without having to abide by more restrictive passing laws.

Crossing solid yellow lines is generally prohibited to maintain safety and order on the roadway, particularly in situations where oncoming traffic poses a hazard. Therefore, while the options that mention passing other vehicles or making U-turns might seem reasonable, they do not align with the guidelines set forth in the Hawaii Driver's Manual, which allow for left turns in specific scenarios. Understanding the appropriate use of solid yellow lines is essential for safe driving practices.