What does a solid white line along the edge of the roadway indicate?

• A. It marks the center of traffic lanes.
• B. It indicates a no-parking zone.
• C. It marks the edge of the shoulder.
• D. The edge line marks the boundary of the drivable roadway.

Answer: (D)

A solid white edge line shows where the paved roadway ends and the shoulder begins, marking the boundary of the drivable surface. It helps you stay within the usable roadway, especially at night or in bad weather, and you shouldn’t cross it during normal driving. The line is different from a centerline, which guides lane placement and passing, and from signs or curb markings that indicate parking rules. While it can align with the shoulder edge, its primary purpose is to define the edge of the drivable roadway.