What does a white line on the road indicate?

Answer: B — Lane boundary; you can change lanes if safe

A white line on the road indicates a lane boundary, which allows vehicles to change lanes if it is safe to do so. This type of line is typically used to delineate separate lanes of traffic moving in the same direction, helping to maintain orderly flow and organization on the road. When drivers see a white line, they know they can switch lanes as long as they have checked their mirrors and ensured that the lane change can be executed safely without interfering with other vehicles. The other choices describe different road markings or scenarios that do not apply to a simple white line on the road. For instance, no entry lines or indications regarding bike lanes and pedestrian crossings are usually marked with different colors or styles of lines, such as red for no entry or dashed lines for bike lane separations. Therefore, recognizing that a white line serves the specific purpose of marking lane boundaries is crucial for safe and effective driving.