Question A double solid yellow line down the center of a two-lane road indicates: Answers Lanes are moving in opposite directions and operators are not permitted to pass. Lanes are moving in opposite directions and operators are permitted to pass when it is safe to do so. Lanes are moving in the same direction and operators are not permitted to pass. Lanes are moving in the same direction and operators are permitted to pass when it is safe to do so. Explanation Yellow lines are used to separate traffic moving in opposite directions. Solid lines indicate that operators are not permitted to pass.