I don't know how many years back they go but my 2013 has both features (alerts crossing a lane line without the turn signal on and if approaching something with too much speed variation) as part of a Driver Alert package.
I think he's just saying he doesn't turn the wheel until its clear to turn so some idiot doesn't hit him from behind and send him into oncoming traffic." Is there a used cadillac that matches my dts with these feature"
Do you mean wheels that can be adjusted so they don't turn into oncoming traffic? If so, yeah, I think you might be able to find a few of those for sale.