Where will you typically see a no-passing zone sign on a two-lane or two-way road?

Answer: D — On the left side of the road

A no-passing zone sign is used to warn drivers that passing is not allowed ahead because visibility or road conditions make it unsafe. On a two-lane, two-way road, this warning is placed on the left side of the road so it’s clearly visible to drivers approaching from that direction. Seeing the sign in time helps you stay in your lane and refrain from trying to pass, which is exactly what the rule requires in that stretch. The other placements don’t reliably reach all approaching drivers or aren’t standard for this warning.