What does a broken white line separate?

Answer: B — Lanes of traffic moving in the same direction, where passing is allowed.

A broken white line is used to indicate that lanes of traffic moving in the same direction are separated, and it allows for changes between these lanes, including passing. When you see a broken white line, it signals drivers that they can safely merge into an adjacent lane or pass another vehicle, provided that it is safe to do so. This is an important regulation that helps maintain the flow of traffic while still allowing for flexibility in maneuvering. In contrast, solid lines or lines of a different color (like yellow) have different meanings, such as separating lanes of traffic moving in opposite directions or indicating that passing is not allowed. Understanding the function of these lines is crucial for safe driving and adherence to traffic regulations.