What action should you take when you approach a solid white line on a divided highway?

When approaching a solid white line on a divided highway, the appropriate action is to not cross it at all. This indicates that the lane is designated for specific purposes, such as separating traffic or restricting lane changes. Solid white lines are used to indicate that crossing them could create danger, as they typically denote a transition zone where lane changes are discouraged or prohibited.

Drivers should adhere to this marking for safety reasons; it helps maintain smooth traffic flow and reduces the risk of accidents by preventing unnecessary lane changes. Understanding and respecting road markings, including solid white lines, is crucial for promoting safe driving practices and ensuring the safety of all road users.