You may cross a single solid white line on the highway:

Only to turn left.
At any time.
When obstructions on the road make it necessary.
To pass another vehicle.
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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