There is a technique I was taught for my CDL. We were told to start slowing before entering the intersection. This gives a vehicle a better prep for a stop. This may seem like it takes away from time but it works. Now I don't always do this in my car or bike, but I'm sure when you feel you may get cut off it should help out.
I had drivers turn left right in front of me when I was driving a school bus, a BIG YELLOW bus! How the hell do you miss that?