U-Turn vs. Right Hand Turn

[ASIAN JUL]

First off, I live in PA. This has happened to me a few times, and I always wondered, "What if?" Where I work, I have to make a U-Turn to be able to get to the road that takes me home. It's 2 lanes on one side, with medians in the middle, with occasional breaks to allow for U-Turns/turns across traffic. There's a third lane where I turn, for turning.

The place where I make a U-Turn is at a light (which has a turning lane & a turning arrow) and there's no signs indicating that you can't make a U. When the light turns green for me, with the green turn arrow, and I go to make my U-Turn. But, sometimes people waiting to make a right hand turn off of a street that comes out right where I make a u-turn.

It's hard to explain, so I made a stupid diagram. The blue car is me, the purple car is the one making a right turn on red into my lane



My question is, if I am making a legal U-Turn when I have the green light (and turn arrow), and someone makes a right hand turn on red into the lane I'm u-turning into, and we somehow managed to crash, who's fault would it be?