It prevents you having to make a left turn across traffic. Where before you would be stuck waiting for an opening (or the next light cycle to get a green arrow), with a diamond, as soon as you’re at the turn lane, you can go. It keeps traffic moving more smoothly since no one has to wait for that opening to come (or misjudge the amount of time they have and cause an accident turning in front of someone going too fast to stop).
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