I've been living in Germany for just under a year now, and expect to for several more. I'm only 25, so it is extremely unlikely that I'll die here. However, I do drive in Bavaria (Autobahns with crazed BMW and Audi drivers and two-lane state highways with poor visibility and crazed BMW and Audi drivers) and like to ski.

What steps do I need to take to ensure that should something horrible happen and I end up incapacitated, I won't be stuck on life support long after any chance for recovery has passed? I have no relatives over here, and workmates and German acquaintances I like and trust, but would feel uncomfortable potentially burdening with life-and-death decisions.

Does Germany have an equivalent of a "Living Will"? Would it be honored if, say, I had a skiing accident in Austria or didn't look the right way crossing the street in London?