A woman died after being hit by a vehicle as she walked along the M25 in the early hours of this morning, police said.
Detectives are appealing for witnesses to come forward following the fatal collision, which happened at around 2.50am.
The woman, in her 30s, was walking near the slip road at Junction 13 at Staines-upon-Thames, Surrey, when she is believed to have been struck by a vehicle travelling along the busy motorway that circles London and branches off into different routes.
The victim was pronounced dead at the scene.
A man driving a black Volkswagen Golf, which was found nearby and is suspected to be a company car, has been arrested on suspicion of failing to stop following a collision and providing a positive breath test. He remains in custody for questioning.
Shortly after the fatal collision, a second collision took place between Junctions 13 and 14 involving a white minibus, a black Range Rover, a silver Vauxhall Meriva and a bronze Honda CRV.
The driver of the minibus, who was the sole occupant of the vehicle, was taken to St George’s Hospital with a serious leg injury and is expected to undergo surgery later today.
The driver of the Range Rover was taken to St Peter’s Hospital in Chertsey with a suspected neck injury. The occupants of the other vehicles were unharmed but were treated at the scene for shock.
The M25 was closed for at least five hours anti-clockwise for the six miles between Junction 14 at Heathrow Airport to Junction 12 at Chertsey. It is now fully reopened to traffic, police confirmed.
Police are asking for any for witnesses to contact them on 101, quoting incident reference P15008681.Reuse content