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For this scenario, I've seen new lights have the left turn arrow blinks. It lets you know you can turn left if it's safe to do so.

It took a while to get used to because in the past there simply just won't be any signal, to imply you can go if you want.

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I've really loathed my time driving in socal coming from the midwest. The idea that I cannot turn left on green is one of the more appalling "features" of traffic management here (the way the lights work, in general is abhorrent). But slowly, throughout socal, I've seen the flashing yellow left-turn arrow; a subtle change to the UX that I think is brilliant and should be adopted everywhere.

They've started putting these (blinking yellow arrows for non-protected left turns) all over Austin. Confused the heck out of me at first as well.

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