Left turns are prohibited here, usually because the turn would cross heavy oncoming traffic or feed into a one-way street against its flow.
Go straight or turn right, then loop back legally. Three right turns make a left, and all three are legal.
Slash over the left arrow = the left door is locked.
Making the turn anyway when the arrow signal is dark. The sign applies at all times unless a plaque under it says otherwise.
Signs that live in the same family, or get confused with this one.
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