The ''Klassikwelt Bodensee'' car fair is drawing classic car fans from around the world to the shores of Lake Constance in the city of Friedrichshafen. Oldtimers like the Rolls Royce Silver Dawn 1951 and a rocket car from German automaker Opel are on display.So is the ''Hotrod,'' the low-riding Ford with impressive horsepower, as well as the historical Mercedes race car. And right next to the car fair, visitors can take the cars of tomorrow--including electric cars--for a spin on a test course.