What color lines separate lanes where traffic is going in the same direction?

White lines are used to separate lanes where traffic is moving in the same direction. This is a standard practice in roadway markings, as white lines help drivers understand that they can change lanes or travel in the same direction as other vehicles in adjacent lanes. The use of white for this purpose promotes safety and organization on the road, allowing for smoother traffic flow. In contrast, yellow lines typically indicate lanes where traffic is moving in opposite directions, signifying that passing or crossing into the other lane could be dangerous. Understanding these color codes is essential for safe driving and navigation on the roads.