A single broken white line down the center of a two-lane road indicates:

Do not cross the line unless you must do so to avoid a hazard.
You may cross this line only if you are making a left turn.
Lanes are moving in opposite directions and crossing this line is not allowed.
You may cross this line to change lanes when it is safe to do so.
Explanation

White lane lines separate lanes of traffic moving in the same direction. If you are traveling next to a single broken white line, you are allowed to cross it to pass the vehicle in front when it is safe to do so. This is not allowed if you are traveling next to a single solid white line or next to double solid white lines.

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