On a four-lane divided roadway or a one-way road, a solid yellow line usually marks:

A solid yellow line typically marks the center of the roadway on a four-lane divided roadway or a one-way road. It indicates that passing is not allowed for vehicles traveling in either direction. This is important for maintaining safety on the road, as it helps prevent head-on collisions by clearly delineating lanes of traffic. While the marking can sometimes be confused with other line colors, recognizing it as a boundary for no-passing zones is crucial for drivers. In circumstances like these, a solid yellow line indicates a significant hazard, reinforcing the need to stay in your lane and proceed with caution.

The other options entail different meanings: a solid yellow line does not mark the left or right edge of the pavement; those positions are generally marked by solid white lines instead. Understanding these distinctions ensures that drivers follow the rules of the road effectively, contributing to overall traffic safety.