Passing on the right is permitted in all of the following situations, EXCEPT:

• A. On a road with two or more lanes traveling in the same direction
• B. When the vehicle ahead is turning left and there is a clear lane on the right
• C. When the lane to the right is open and clear
• D. On a single-lane road where traffic moves in both directions

Answer: (D)

Passing on the right is allowed only when there’s a safe, designated space to do so. On roads with two or more lanes in the same direction, a vehicle can move into the right-hand lane to pass if that lane is open and it’s safe to do so. If the vehicle ahead is turning left and there’s a clear lane on the right, you may pass on that right side to avoid being blocked by the turn, as long as you’re in a legal passing area and maintain safety. If the lane to the right is open and clear, that same space can be used to pass.

But on a single-lane road where traffic moves in both directions, there isn’t a separate right-side lane to use for passing. Trying to pass in such a situation would require driving into the opposite lane or onto the shoulder, which is unsafe and typically illegal.