This white sign means you:

Must wait for the solid green light before you turn left.
May turn left on a green light when it is safe to do so.
Must wait for the solid red light before you turn left.
May turn left only on a green arrow.
Explanation

Lane use control signs are placed at intersections above the traffic lane they control to show what maneuver(s) are permitted from that lane. This sign indicates that a left turn is allowed when the circular green light is on, but drivers must yield to oncoming traffic. You'll typically find this sign near the left-turn traffic signal. The purpose is to remind drivers that while left turns are permitted on a green light, they aren't protected.

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