AT stopping distance?

[pentium9]

I learned a lot from this site

Anyway, instead of starting another thread, just want to ask regarding emergency stopping a vehicle with AT if it looses its brakes? (specially running at highways or EX way)

Safety First! yes,, it is.. but what if that happen? AFAIK, MT can be slowed by the lower gears? How about for AT? Can one shift to P for emergency stopping of the car? (to save life.....at least)

Thanks in advance!