Possible Clues:

• Highway network that famously has sections without a speed limit
• Fast route from A to B, then regularly dashing around university
• Golf in Germany may need such a course
• One for the road at bar overlooking hotel - in the German way presumably built for fast types
• U-boat damaged, initially holed in a north German route
• Where cars race about madly, dashing at intervals
• A university town's expression of contempt for western motorway
• Hunt a boa slithering around German motorway
• Hang about after accident -- not good sort of road
• Karl's route perhaps about to change, Aachen regularly avoided