What does a double solid yellow center line indicate, and is passing allowed?

• A. It means only the left lane is for passing.
• B. It indicates a shared lane where passing is allowed with caution.
• C. It indicates a bus-only lane during certain hours.
• D. It indicates a no-passing zone for traffic on both sides; passing is not allowed.

Answer: (D)

A double solid yellow center line means no passing for traffic on either side. This marking is used where visibility is limited or the road geometry makes overtaking dangerous, such as on curves or hills or near intersections. Stay in your lane and do not attempt to pass the vehicle ahead until you’re in a location where passing is permitted (typically where a broken line appears or at a designated passing zone). The other ideas—that one lane is for passing, that it’s a shared lane with passing, or that it’s a bus-only lane—don’t fit this marking, which clearly signals that passing isn’t allowed in either direction.