What do two solid yellow lines mark when there are four or more lanes with traffic moving in opposite directions?

Two solid yellow lines mark the center of the roadway when there are four or more lanes with traffic moving in opposite directions. This marking indicates that vehicles are not allowed to cross these lines to pass, emphasizing the importance of maintaining safe separation between oncoming traffic. The presence of these lines helps drivers understand the layout of the road and reinforces safe driving practices by preventing unsafe maneuvers such as passing on the wrong side. The clear visual cue provided by the solid yellow lines is crucial for ensuring that all vehicles remain in their designated lanes, contributing to overall safety on the roadway.

The other options do not accurately describe the function of solid yellow lines in this context. While edges of the roadway might be indicated by other markings, turning lanes are typically marked differently, and pedestrian crossings have their specific signs and markings to ensure visibility and safety for those crossing the road.