Who has the right a way the person with a green light and a green arrow pointing left or the oncoming traffic does?

Normally, the green arrow would indicate that the opposing traffic has a red light and as such the green arrow traffic has right of way.

However, due to mechanical or planning errors it is possible that the opposing traffic will also have a green light. If this happens, the opposing traffic (by virtue of going straight) has right of way. If this opposing traffic does not appear to be stopping, green arrow traffic should assume that opposing traffic has a green arrow and right of way. In the event of a collision when both have green, green arrow traffic (turning left) will be found At Fault except in no-fault states where this will be considered a no-fault accident.