Solid white lines are used to mark which features?

• A. To mark the center of the road
• B. To indicate there is a bicycle lane
• C. To mark the left edge of highways
• D. To mark the right edge of highways

Answer: (D)

Solid white lines define the boundary of the roadway on the right side, marking where the paved surface ends and the shoulder begins. They help you stay in your lane and discourage crossing, which is why they’re used to denote the right edge of highways. The left edge and center lines use yellow markings, so a white line isn’t describing a bike lane by itself—the bike lane is indicated by symbols and signs in addition to any lane-edge markings.