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This is an exception and a too-clever-for-its-own-good use of a traffic light. Usually we use a blue sign with a white arrow pointing right to show you can only turn right.

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Thanks for the clarification. It's a bit odd in that it already has the right turn only sign but they decided to also install a traffic light --maybe the solid striped median line and the right turn only were not enough to signal people and there were enough accidents that the DoT decided to make it really obvious that vehicles should not cross.

It does not have a right turn only sign. It just has a green arrow.

The only reason you can only ever turn right is because the light stays red, if it were to turn green you'd be allowed to cross the intersection in any direction.

There are also different rules that need to be followed when crossing the intersection on account of a green arrow than, if it were merely a turn right only situation.

Half meter above that green arrow right, is a blue right turn only sign. It's on the same pole.

The traffic light takes precedence over the static sign (which is only there as a fallback).

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