The stunt which was shown on German TV and has become a hit on YouTube shows the man building up speed by holding onto a motorbike before freewheeling for two miles downhill.

Wearing a red and white protective suit and helmet he is seen doing 100km/h (62mph) along the Ulm-Stuttgart road with a 80km/h (50mph) speed limit.

Goeppingen police say the man if caught (and not hit by an oncoming lorry) faces losing his driving licence and a heavy fine.

They added that they are particularly concerned about copycats who may imitate the stunt ... with less success.