Dirk Auer decided to go where no sane man or woman had gone before and skated down an 860 metre track in just over a minute.

Wearing specially designed in-line skates, the German made the attempt on the Mammoth roller coaster at the Trips Drill theme park in Stuttgart.

The 36-year-old admitted he had placed his life at risk by performing the daredevil stunt.

'This was a very dangerous stunt because there were so many factors to consider,' he said.

'The roller caster is wooden and so unlike rides made from iron and steel there was always a chance of the odd nail or screw that would not be entirely flat.
Travelling at speeds up to 90 km/h (54mph) Auer skated the entire length of the rollercoaster - 860 meters - in just over a minute

'If the skates were to catch a stray nail then I could have fallen and I would almost certainly have died.'

Spending two months planning the outrageous stunt, Mr Auer also designed and made the monster skates, which took him a total of 110 hours' work.

But he said there was no room for error and he used 16 rolls on each shoe.

'When I reached the first drop I was 30 metres high and this allowed me to reach speeds of 90kmh on descent.,' he said of Saturday's stunt.
Dirk Auer in Stutgart Germany

'After this some of the sides were so high that at times I was at 90 degrees and so it was very important to have as much traction as possible. Luckily everything went according to plan - it was a lot of fun.'

Mr Auer, from Gross-Gerau near Frankfurt, is considered to be the most extreme in-line skater in the world.

He already holds the world record for reaching speeds of 190mph as he was dragged along behind a Porsche GT2.