Part of the M25 motorway anti-clockwise is currently closed following a fatal crash.
A man died after a lorry hit a parapet of an overbridge between Junctions 17 and 16 just after 1pm.
Thames Valley Police are currently at the scene and the road is expected to remain closed for several hours.
Drivers are facing long delays as all traffic is being diverted to the A412 and the A40.
Delays are stretching back to Bricket Wood.
Police are appealing for information on the crash and anyone who witnessed the incident is asked to contact the non-emergency number 101.