On one-way roads, yellow lines are used as which edge marking?

• A. Right-edge lines
• B. Left-edge lines
• C. Center lines
• D. Shoulder lines

Answer: (B)

On one-way streets, the left edge of the roadway is marked with a yellow line. This color helps you quickly identify the boundary on the left side when traffic isn’t moving in opposite directions. The right edge uses white lines, and center or shoulder markings serve other purposes, so the yellow left-edge line is specifically about marking the roadway’s left boundary on a one-way street. Keep to the right of this line to stay within the driving lane and avoid drifting off the pavement.