Driver's License Test Prep
US Road Signs Road Markings

A solid white line runs along the right side of the roadway. What does it mark?

A single solid white line running lengthwise along the lower edge of a dark roadway.
  1. A.
    The right edge of the travel lane and the boundary with the shoulder Correct
  2. B.
    The centerline between traffic moving in opposite directions
  3. C.
    The boundary between two travel lanes going the same direction
  4. D.
    A zone where passing other vehicles is prohibited
The Why

The answer is "The right edge of the travel lane and the boundary with the shoulder"

A solid white line on the right side of the road marks the right edge of the travel lane and separates the lane from the shoulder. The trap is the same-direction lane choice: white does divide lanes moving the same way, and a driver applying that broad rule can miss that this particular line hugs the shoulder rather than sitting between two travel lanes.

Why the others miss

The traps in the wrong answers

B. The centerline between traffic moving in opposite directions

Centerlines that divide opposing directions of travel are yellow, and a white line never separates traffic moving in opposite directions. This answer applies the meaning of a yellow centerline to a white line based only on where it sits across the roadway.

C. The boundary between two travel lanes going the same direction

Solid white lines between two travel lanes do exist, but a line on the right side of the road runs against the shoulder, not against another lane of traffic. This answer treats every solid white line as a lane divider without noticing this one sits on the outer edge of the roadway.

D. A zone where passing other vehicles is prohibited

No-passing restrictions are marked with yellow centerline markings or posted signs, not with a solid white right-edge line. This answer comes from the general rule of thumb that a solid line means don't cross, applied to passing without the color check the manual actually uses for no-passing zones.

The Rule

This question tests your knowledge of Road Markings on the roads of every US state . Source: Manual on Uniform Traffic Control Devices, marking 3B.06 (Solid White Right Edge Line)..

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