Solid white lines indicate which of the following about traffic direction?

Solid white lines indicate which of the following about traffic direction?

• A. They indicate you may pass to the left
• B. Traffic is moving in the same direction
• C. They separate traffic moving in opposite directions
• D. You must stop at the line

Answer: (D)

Solid white lines that run between lanes show that all the traffic in those lanes is traveling in the same direction. They mark lane boundaries and indicate that you shouldn’t cross them to change lanes unless the marking allows it (for example, where a dashed line appears). This is why the meaning here is about direction: these lines keep vehicles aligned in the same flow of traffic. The other ideas don’t fit: passing to the left is governed by dashed rather than solid lines, lines that separate opposite directions are typically yellow, and a stop line at an intersection is a separate marking telling you where to stop, not about how traffic moves between lanes.

Solid white lines that run between lanes show that all the traffic in those lanes is traveling in the same direction. They mark lane boundaries and indicate that you shouldn’t cross them to change lanes unless the marking allows it (for example, where a dashed line appears). This is why the meaning here is about direction: these lines keep vehicles aligned in the same flow of traffic. The other ideas don’t fit: passing to the left is governed by dashed rather than solid lines, lines that separate opposite directions are typically yellow, and a stop line at an intersection is a separate marking telling you where to stop, not about how traffic moves between lanes.