What type of markings are used to separate opposite traffic movements on a roadway?

Center lines are specifically designed to separate opposing traffic movements on a roadway. They provide a visual cue to drivers about the appropriate lane to stay in, thereby promoting safe driving practices and reducing the risk of head-on collisions. Typically, center lines are depicted with solid or dashed markings, where a solid line indicates no passing is allowed and a dashed line permits passing when safe to do so.

Other types of lines on a roadway serve different purposes. Lane lines are used to delineate individual lanes within the same direction of travel, primarily to help maintain order within each lane. Edge lines are utilized to mark the edges of the roadway, assisting drivers in knowing where the road ends, which is especially critical on unpaved or rural roads. Guide lines, although used for providing directional guidance to drivers (such as in intersections), do not primarily serve to separate opposing traffic. Thus, center lines are the most appropriate and effective marking for this specific purpose.