From the FAQ at http://www.DasHugel.com:
Why shouldn’t I ride Das Hugel? It’s extremely dangerous. Some of the descents are wickedly fast with winding turns. There’s grooved pavement, traffic, grumpy police, steep grades up that might leave you falling over in your clips, etc. Your doctor would advise against it unless your ticker is in top shape. Your spouse would force you to up your life insurance.
Really? OK, it’s an unforgettable experience. Gorgeous scenery. And everyone is joined in the camaraderie of pain.