my (adrian flux arranged) breakdown cover will recover me from across the EU, but will definately check out insurance small print. if the 'ring is legally considered to be a 'toll road' then i cant see any problem with the insurance either (which also covers me across the EU). best to be safe than sorry i guess.
ALWAYS check the small print.
Check your breakdown cover, too. I would be willing to wager they won't recover off the 'ring. ADAC will at this time and when you look at the general cover provided by them you'll see that they really are the Rolls Royce of EU recovery companies.
The bad news is that as soon as you drive on the 'ring you're on the margins of EU law and you'll be driving through regular grey areas, too.
The good news is that provided you're not driving like a c0ck you'll be having an absolute ball and you'll be worrying more about the 911s tearing past you far more than whether you're insured or not (provided you've checked that in advance).