What does a solid white line on the road indicate?

A solid white line on the road indicates that lane changes are discouraged or prohibited. This type of line is often used to separate lanes of traffic moving in the same direction, and it serves as a guideline for drivers, signaling that they should stay in their lane. Crossing a solid white line can create unsafe situations, particularly in busy traffic, as it may involve moving into a space where there is not enough clearance or distance to maneuver safely.

In contrast, lane changes are generally permitted when there are dashed or broken lines, which indicate that it is safe to move to an adjacent lane when conditions allow. The presence of a solid white line helps maintain order and safety on the roadway by encouraging drivers to remain in their designated lanes unless absolutely necessary to change lanes.