i was going straight at a 4 way intersection I hit a truck that made a left hand turn in front of me. I am sure I had the green light, he says he was completing his left hand turn. I hit him in the passenger rear side. A witness stoped and stated he saw the truck turn in front of me. I have limited colision on my 1998 Blazer and it is totaled. My insurance company is trying to determine fault. Whos fault does this appear to be?