If the "no left turn" sign to the right of the signal is illuminated (visible), then left turns are currently restricted, based on time of day. It's an alternative to the signs that specifically list the days and times you can't turn left, usually during peak traffic periods.
If the "no left turn" sign is off (sign will appear blank) left turns are permitted, and are the only valid turns from that lane per the sign to the left of the signal.
tl;dr:Left sign restricts the lane to left turns only, at all times. Right sign prohibits left turns during specific times of certain days.
I’m pretty sure you missed the point. The lane actually does permit left turning - when the light is green. The drivers sitting there don’t realize that because the “no left turn” sign is lit, the left turn signal will never change.
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