On a divided highway, what indicates the left edge of traffic lanes going in the same direction as you?

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On a divided highway, yellow lines mark the boundary between traffic moving in opposite directions. The line that shows the left edge of the lanes going in your direction is a yellow line, and it can be solid or broken. A solid yellow line means you should not cross it to enter the opposing traffic side, while a broken yellow line indicates you may cross when it’s safe. White lines are used for lanes within the same direction or for the road edge, not the left edge of your direction’s traffic on a divided highway.