Reference: 

Rant on Exiting Intersections on Yellow/Red (for new drivers)

Of course this is just ONE MERE example of leaving the intersection on a left turn. I will have to do a more complete video in the near future. It is very subtle, but you can notice how the left turning vehicle starts moving towards the turn even when it’s not 100% obvious that the right-turning car is planning to stop. If need be, either or both cars could still then slow or stop to prevent a collision. By starting to move, it sends a hopefully clear signal to the other driver that you are very serious about completing your turn very soon.