What does a solid white line separating lanes mean?

A solid white line separating lanes indicates that lane changes are discouraged. This means that while it is not illegal to change lanes in these areas, drivers should exercise caution and only do so when it is safe and necessary. The presence of a solid white line typically denotes that lanes are meant to be kept separate to maintain traffic flow and safety, often found in areas where frequent lane changes could lead to confusion or accidents, such as on highways and major roads. This rule helps drivers understand when they should remain in their lane to ensure smooth and orderly traffic conditions.

The other options imply behaviors that do not align with the meaning of a solid white line. For instance, encouraging lane changes or prohibiting overtaking would contradict the cautious approach suggested by the solid white line. Likewise, it does not relate to stopping restrictions, which are indicated by different traffic markings or signs.