Question:
White lines are used to separate lanes of traffic that are moving in the same direction. Double solid white lines are often used on highways to separate a high-occupancy vehicle (HOV) lane from other lanes that are traveling in the same direction. You should never cross a double solid white line. [1. Types of Line Markings, C. Highway Pavement Markings, Section IV - Signals, Signs and Pavement Markings, Maryland Driver's Manual]