According to the Arizona Driver’s License Manual, “White lane lines separate lanes of traffic moving in the same direction. A single white line may also mark the right edge of the pavement.Broken white lines separate two lanes of traffic traveling in the same direction.A solid white line marks the edge of the roadway or separates lanes of traffic moving in the same direction.”. single white line may also mark the right edge of the pavement. Broken white lines separate two lanes of traffic traveling in the same direction. A solid white line marks the edge of the roadway or separates lanes of traffic moving in the same direction.”.