What should you do upon seeing a solid white line on the road?

Answer: C — Prepare to stop for a traffic signal or sign

When you see a solid white line on the road, it indicates that lane changes are discouraged. This line typically signifies that crossing it could be unsafe, often found on roads where lane shifts would lead to potential hazards, such as areas near intersections or where there might be pedestrian crossings. Preparing to stop for a traffic signal or sign is the appropriate response because a solid white line often appears in situations where a vehicle needs to slow down or come to a stop, especially at intersections or crosswalks where pedestrians may have the right of way. This awareness is crucial for ensuring safety and compliance with traffic rules. In contrast, overtaking other vehicles is not advisable in areas marked with a solid white line, as it can lead to unsafe maneuvers. Signaling your intent to turn may also be irrelevant unless you are preparing to make a turn where it is legal and safe to do so. Blending with traffic is generally important, but it should always be done in compliance with road markings, and a solid white line indicates that caution is needed.