Stewart coined this name because the punishing 14-mile layout cuts directly through the dense Eifel forest, where unpredictable weather adds to the extreme danger.

Standard German traffic laws apply during these public sessions. Drivers can be ticketed by local police and are legally required to pass slower vehicles only on the left.

The track's 73 treacherous corners and steep elevation changes provide a grueling stress test for suspension and aerodynamics that a traditional flat circuit cannot match.

At 14 miles long, the circuit was too massive for medical crews to cover adequately. This critical flaw forced fellow drivers to rescue Niki Lauda from his fiery 1976 wreck.