What sign is used to indicate the separation of two lanes traveling in the same direction?

The presence of a white line on the road indicates the separation of two lanes that are traveling in the same direction. This use of a white line allows drivers to change lanes safely and indicates that they are in lanes designated for movement in the same direction, such as on a multi-lane road. The white line serves as a guide that helps organize traffic flow and maintains lane discipline.

In contrast, other colors like yellow are used to delineate traffic moving in opposite directions or to indicate no passing zones, while red and blue lines do not have specific meaning in the context of lane separation for traffic in the same direction. Therefore, understanding the role of these different line colors is essential for safe navigation and adherence to traffic regulations.