An angry motorist berated by a biker for driving in the cycle lane punched the rider so hard he fell off his bike.

The road rage incident - which was captured on camera - happened at around 9am on January 23 on Clerkenwell Road near the junction with Farringdon Road, Clerkenwell.

The video - which has half a million views on Youtube - shows the cyclist speak to the driver of a white Audi when he entered a cycle only section of the road.

When the motorist speeds off as the lights change, the rider chases after him, catches up with him and shouts “you f*****g p***k” through the window.

The driver gets out and punches the cyclist in the face, causing him to fall on the floor.

No arrests have been made - but police want anyone with any information to call 101 or Crimestoppers anonymously on 0800 555 111.