Solid white lines are used to mark which features?

• A. To mark the right edge of highways, and between lanes to indicate areas where lane changes are discouraged or unlawful
• B. To separate traffic moving in opposite directions
• C. To indicate minimum passing zones
• D. To designate pedestrian crosswalks

Answer: (A)

Solid white lines are about keeping you in your lane and treating the road edge as a boundary. They mark the right edge of the roadway and, when placed between lanes, indicate that changing lanes is discouraged or unlawful in that area. This helps keep traffic flowing smoothly and reduces weaving, especially on curves, near exits, or where visibility is limited. By contrast, lines that separate traffic moving in opposite directions are typically yellow, and dashed white lines between lanes signal that lane changes are allowed when it’s safe. Pedestrian crosswalks are marked with different patterns, not the solid white line patterns described here.