You are driving on a two-lane road. There is a double solid white line between the two lanes. Which of the following is true?

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]