If you see one or two solid yellow lines in the center of the road, what does it indicate?

The presence of one or two solid yellow lines in the center of the road serves as a critical indicator of passing regulations. When you see a solid yellow line, it signifies that passing is not permitted for vehicles traveling in either direction. This is a safety measure aimed at reducing the likelihood of head-on collisions and ensuring that drivers obey specific traffic rules.

The solid yellow line indicates that it is unsafe to overtake another vehicle, regardless of the conditions such as time of day or the proximity of oncoming traffic. Understanding this rule is essential for all drivers to maintain order and safety on the roads. In contrast, the other options suggest varying scenarios regarding passing that would violate this fundamental traffic rule represented by solid yellow lines.