Several models have a version of this already in that it alerts the driver when
other vehicles get into your blind spots, slows closing rate, etc. This however
isn’t communicated to the other vehicle which apparently what this new program
will do. More gov’t dictates.
So, this will go into effect before the pile of dung leaves office. My current vehicle is 5 years old. I am approaching 70 so my next vehicle will probably be my last I buy. It will be a 2016 for sure.
The only ways to increase capacity is by stacking roads vertically or stacking cars "nut-to-butt" horizontally. California, being earthquake country, sees nut-to-butt as the more workable solution.
From a software/hardware point of view this is all quite manageable. I expect that it will be abused every bit as often as the internet is and by much the same parties. Everything has its price, want to play?