equus123 has a nice diagram. I do the same thing. The other interesting point too is that the cars generally will cut the corners so that they are make a really tight turn. And you making a very wide turn. This helps with the buffer zone. Another thing with this method is it helps a lot if you can "jump" off the line (accelerate as fast as possible so you are not next to the car as both of you make the turn). "jump" here doesn't mean that you start before the light turns green. Too many drivers around where I live run a red light.

And Like lisa says too. think of your "escape route".

As for idiots on cell phones. I make sure I get an eye contact and I wave my hand and let him know with no uncertain terms of my intention. If he is still unaware then I will tap his hood with palm of my hand to get his attention. They sometimes get mad but hey its my life.

And always assume the worst in car drivers.