Araneta corner N. Domingo, San Juan

Here's a major choke point.  I've wondered why no one cares to fix this; perhaps it's more complicated than it looks to me.

What happens is we have a four lane south bound Araneta avenue going into a two lane street on either left or right.  Vehicles going to the right aren't the problem.  What is really the issue here is that the four lane avenue, despite proper lane markers and left-turn/right-turn signs, is transformed into five lanes going to the left, and one lane going to the right.

It doesn't take a genius to simulate what that ensues.  Five lanes all turning into two lanes is a lot of merging.  What gives?

Perhaps MMDA can make physical barriers to reduce the converging lanes.  Or perhaps they should take lane division as a traffic offence.  Seriously.