What is the meaning of a double solid yellow line in the center of the road?

A DOUBLE SOLID YELLOW line in the center means PASSING IS PROHIBITED for traffic in BOTH directions — neither direction may cross the lines to pass. DMV/permit test. YELLOW lines separate OPPOSING traffic. Line variations: SOLID yellow on your side = no passing for you; BROKEN yellow = passing allowed when safe; DOUBLE SOLID yellow = no passing either direction. You may cross a double yellow line only for specific permitted reasons (e.g., turning into a driveway, where allowed). Knowing the double solid yellow line prohibits passing in both directions is a commonly tested road-marking concept.