What is the primary reason for the presence of solid lines on the road?

Solid lines on the road serve a crucial role in traffic management and safety. The primary reason for their presence is to designate no passing zones. This means that drivers are not permitted to overtake or change lanes in areas where solid lines are painted, as it is deemed unsafe to do so. The solid line acts as a visual barrier, indicating that visibility may be limited or that road conditions are not conducive to safe passing.

In contrast, lane change areas are typically marked with dashed lines, allowing for safer transitions between lanes. Hazard warnings are commonly indicated by other road markings or signage rather than solid lines. Lastly, pedestrian pathways are generally designated by specific crosswalk markings rather than solid lines, which primarily function to indicate passing restrictions.