Motorbike filmed racing along Parisian motorway - without a rider

This is the strange moment a motorbike was filmed driving along the motorway - without a rider.

A perplexed passenger captured the bizarre moment on video as the motorbike cruised alone on a Parisian motorway.

The clip begins with the black and grey bike wobbling slightly as it makes its way down the road, driving close to the central reservation.

It shows no signs of stopping, and the cameraman said he was slightly scared and bemused by the sight.

But there is a scientific reason for the "ghost bike".

The driver had actually fallen off the bike in an earlier collision but it had managed to stay up right and in gear.

Speaking to Le Parisian, the cameraman said: "I asked a friend who was with me to take my phone and film.

"On the video, we can clearly see the two-wheeled, without a biker. Is it a ghost motorcycle?"

Parisian stunt expert Jean-Pierre Goy suggested the accelerator got stuck. He said bikes could run 600m or more without a rider.