Which lane-use signal indicates you may use the lane below safely?

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Lane-use signals show when a lane is open or closed to traffic. A steady green arrow pointing down means the lane below is open for use, so you may drive in it safely. The other signals don’t indicate that you may use the lane: a steady red X means the lane is closed, a flashing yellow X warns the lane is about to close and you should prepare to move out, and a steady blue arrow is not a standard indicator for general lane use.