When is passing not allowed on either side of a highway?

Passing is not allowed on either side of a highway when both sides have solid yellow line markings. Solid yellow lines indicate that passing is prohibited, as they are used to separate lanes of traffic moving in opposite directions. This marking is critical for maintaining safety, as it indicates that visibility is likely limited, and overtaking another vehicle could lead to dangerous situations, such as head-on collisions.

When both lanes are marked with solid yellow lines, it reinforces the rule that drivers should not attempt to pass because it is unsafe to do so in that area. This regulation is essential for ensuring that all vehicles maintain a safe distance and adhere to traffic laws meant to protect drivers, passengers, and pedestrians. Other options presented might refer to situations where passing could be considered, but they do not carry the same unequivocal prohibition as solid yellow lines do.