After a crash caused "almost total gridlock" across south Bucks on Wednesday morning, an investigation has been launched to find out the cause of the accident.

At around 7am on Wednesday (May 15) on the anti-clockwise carriageway of the M25 near junction 17, a white DAF lorry, a black Ford Focus and a Triumph Tiger motorcycle were involved in a crash.

The motorcyclist, a man in his 30s, was taken to a London hospital where he is currently being treated for serious injuries.

Both carriageways were closed after the crash to allow an air ambulance to land.

The driver of the Ford Focus, a 57-year-old man from London, has been arrested on suspicion of causing serious injury by dangerous driving. He is currently in police custody.

Sergeant Martin Kemp, from the Bedfordshire, Cambridgeshire and Hertfordshire Road Policing Unit, said: “We have launched an investigation to determine the cause of the collision, and we have already spoken to a number of witnesses at the scene.

“The collision occurred at a time when a lot of people would be making their way to and from work so I am keen to speak to anyone who witnessed the collision or saw either of the vehicles in the lead up to the collision and has not yet spoken to us.

“If you have a dash cam fitted in your vehicle, we would like to view your footage.”

If you can help, please report information online at quoting ISR 99 of May 15 or Operation Rhone.

You can also call the non-emergency number 101 and ask for Herts Police.

Alternatively, you can contact Crimestoppers anonymously on 0800 555 111 or via their untraceable online form at