A woman from Watford died after the car she was driving left a motorway slip-road and smashed into a tree.
Thames Valley Police is investigating a fatal collision which happened on a slip road where the M25 and M40 meet near Hertfordshire.
Between 10.10am and 10.15am on Friday (July 3), a black Mini was travelling along the exit slip between the M25 anticlockwise and the London-bound M40.
Police say the car left the road, hitting a tree.
The driver, which police say was a woman aged in her 50s from Watford, was pronounced dead at the scene by paramedics.
The woman's next of kin have been informed and are being supported by a family liaison officer.
The slip road was closed for more than four hours as police carried out investigations into the collision, and enquiries are ongoing.
#M25 clockwise at Junction 16 for the #M40 London Bound currently closed due to serious collision. @HighwaysEAST assisting with the closure of the junction. Apologies for any inconvenience. We hope to have the road open as soon as we can. #TTCshift #p7419 #p4121— TVP Roads Policing (@tvprp) July 3, 2020
Sergeant Mark Gawthrop, of the joint operations roads policing unit, based at Taplow, Buckinghamshire, said: "We are appealing for witnesses following this incident in which a woman has sadly died.
"Our thoughts are with her family at this difficult time.
"We are carrying out a thorough investigation and we are appealing for anyone who witnessed this collision or anyone who may have dash-cam footage of the incident to please get in touch."
Anyone with information should call 101 quoting reference 43200200317.