Final answer:
Passing is not allowed when a roadway has double solid yellow lines, which serve as a safety measure to prevent accidents where visibility is limited.
Step-by-step explanation:
Passing is not allowed on either side of a roadway when both sides have double solid yellow lines. These lines are road markings that indicate that passing maneuvers are prohibited due to safety concerns, such as limited visibility or approaching a crest or curve in the road. It's crucial for drivers to obey these signs to maintain the safety of all roadway users including drivers, pedestrians, and cyclists.