What is the meaning of a solid white line on the road?

A solid white line on the road is used to indicate that no passing is allowed. This line provides a clear and obvious separation between lanes of traffic moving in the same direction, signaling that changing lanes in this area could be dangerous. The solid white line helps maintain safety by discouraging drivers from trying to pass another vehicle, especially near intersections, pedestrian crossings, or other areas where visibility may be limited.

In contrast, other options suggest interpretations that do not align with the traffic control regulations associated with solid white lines. For instance, a line denoting passing with caution would typically be a broken white line, allowing drivers to change lanes under safe conditions. Indicators for road construction or speed limit reductions rely on specific signage rather than the use of solid white lines, which are specifically designed to regulate lane usage and passing behavior.