What do yellow lines on a road indicate?

The presence of yellow lines on a road primarily indicates that the road is intended for two-way traffic. Yellow lines serve as a visual guide to separate lanes of traffic moving in opposite directions. This helps ensure that drivers navigate safely by clearly marking where one lane ends and the other begins. The use of yellow lines is crucial for maintaining order and safety on the roads, as it informs drivers of the traffic flow and prevents head-on collisions.

In contrast, one-way traffic is typically indicated by solid or dashed white lines, not yellow. Speed limits are usually posted on signs rather than indicated by line colors, while parking restrictions are indicated through signage or curb markings, rather than through yellow lines on the road itself. Hence, when encountering yellow lines, drivers can confidently understand that they should be aware of oncoming traffic and adjust their driving accordingly.