What does a white line on the road indicate?

A white line on the road serves the purpose of indicating that traffic is moving in the same direction. This is important for drivers as it helps them understand the lane structure of the roadway, allowing for safe merging and lane changes when necessary. Typically, solid white lines signify that lane changes are discouraged or not permitted, while broken white lines indicate that changing lanes is permitted.

The other options deal with different aspects of roadway markings or signs. For example, traffic going in different directions is usually indicated by yellow lines rather than white ones, which distinguishes opposing lanes. Speed limits are communicated through signs located along the road rather than being indicated by lines on the pavement. Lastly, construction zones are marked by specific signs and sometimes cones or barriers, not by white lines. Thus, understanding the role of white lines is crucial for navigating roadways safely and effectively.