What does a yellow line indicate in terms of road use?

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A yellow line on the road indicates that traffic is two-way. This marking is specifically used to separate lanes of traffic moving in opposite directions. In many cases, a solid yellow line means that passing is not permitted for drivers, either for safety reasons or because it may be hazardous to cross over into the opposing lane. When a yellow line is dashed, it typically indicates that passing is allowed when it's safe to do so.

In contrast, if a road had a white line, it would signify that the lanes of traffic are moving in the same direction, which is unrelated to the concept of two-way traffic. Other options like pedestrian lanes or restrictions on vehicles are represented through different signage and markings, reinforcing the point that the yellow line specifically pertains to the regulation of vehicles traveling in opposing directions.