Hmmm I gather this policy just covers the damage to the barrier... I wonder if they would add a towing service for a bit extra so you can find yourself 10 miles away and in a ditch.. hmmmm how did that happen?
The big issue is who offers cover that will pay out to third parties at the 'Ring?
Looks like most British insurers ignore the fact it is a public toll road, but German insurers/drivers/authorities don't, so they expect to get a payout from your insurers if you hit them at the Ring.