Which marking indicates the left edge of the roadway on a divided highway?

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On divided highways, the lines that mark the boundary on the left side of traffic are yellow. That color is used to distinguish the edge that separates opposing directions from the right-side edge. The line can be solid or broken depending on the specific section and whether crossing that boundary is allowed. So the left edge is indicated by a solid or broken yellow line. White lines mark the right edge or lane boundaries for traffic in the same direction, which is why they don’t indicate the left edge on a divided highway.