You may cross a single solid white line on the highway:
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Only to turn left.
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To pass another vehicle.
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At any time.
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When obstructions on the road make it necessary.
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Explanation
Solid white lines are used to separate lanes of traffic moving in the same direction and generally discourage or prohibit lane changes. Crossing a solid white line is not advised unless necessary - such as to avoid a hazard or when directed by a traffic officer. While it is not always illegal to cross a single solid white line, you should only do so when it's safe and justified by road or traffic conditions. Always check for other vehicles before changing lanes.
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