Final answer:
A solid white line indicates where movement between lanes of traffic is prohibited.
Step-by-step explanation:
A solid white line is used to indicate where movement between lanes of traffic is prohibited.
It serves as a barrier, preventing drivers from changing lanes or making abrupt turns across the line.
For example, if there is a solid white line separating lanes on a highway, it means that drivers should not change lanes or cross over the line unless there is an emergency or a designated exit.