By nine o’clock on the bitterly cold morning of 28 January 1938, Rudolf Caracciola had broken Auto Union’s mile and kilometre records.
The Mercedes-Benz ace had reached 270mph on the two-lane autobahn between Frankfurt and Darmstadt, but noticed that a strong crosswind was developing and, not surprisingly, admitted to being unnerved by the experience.
Caracciola advised his great rival Bernd Rosemeyer against running, but the Auto Union team was keen to strike back so Rosemeyer climbed aboard the streamlined car and set off.
He was timed at 268.7mph on his return run but noted that the engine was not fully coming up to temperature. The mechanics blanked off more of the radiator and he went out again.
Shortly afterwards came a report from an official at the 9.2km marker – the car had crashed.
Running at maximum speed near the Morfelden Crossing, it had apparently been caught by the crosswind that Caracciola had warned him about.