It turns out that as some one on this thread said "Tesla does things differently". Here is what I found:
As a vehicle approaches your blind spot the image of the road in front of you on your screen zooms out and you have a better view of traffic all around you and behind, not just in front of you.
This would take some getting used to, but possibly it's better, because looking over at the mirror takes your eye farther away from the road in front of you. If you are thinking of changing lanes you immediately will know it is not safe to go there. This will then allow you to do whatever checking you are used to doing, ie looking in the side mirrors or over your shoulder. And, as I understand it, the lane turns red and the car turns red if you put your TS on, if all this fails and you start to move over anyway, it will scream at you. I am not sure if you need to be in auto pilot (auto steer)for this last sentence to be true. Can anyone verify that last part for me. Thanks