PFAFFENHAUSEN, Germany, March 14 — Ask Marc Bongers about the wisdom of introducing a speed limit on the German autobahn, and he answers by impatiently revving the 435-horsepower engine of a specially modified Porsche. Slowpokes, he said, already spoil half the fun.

“A lady,” Mr. Bongers sniffed, as a Mercedes scuttled out of his way in the passing lane on a busy highway in southern Bavaria. “And she’s talking on her phone,” he said the other day, shooting her a sidelong glance. “Doesn’t she know it’s against the law to do that on the autobahn?”

With a stretch of empty road ahead, Mr. Bongers floored the gas pedal, and within seconds the speedometer registered 286 kilometers an hour (178 m.p.h.) — something that is still legal here. That, by way of comparison, is about the speed of a commercial jet taking off.

Few things are closer to the German heart than the freedom to drive like Michael Schumacher, the fabled Formula One champion. Rule-bound and risk-averse in so many other ways, Germans regard driving on the autobahn at face-peeling speeds as close to an inalienable right.