White lane lines separate lanes of traffic moving in the same direction.
• Single broken white line. You may cross this line to change lanes when it is safe to do so.
• Single solid white line. You may travel in the same direction on both sides of this line, but do not cross the line unless you must do so to avoid a hazard. Also used to discourage lane changes near intersections.
• Double solid white lines. Crossing a double solid line is not allowed.