Detectives from the Roads and Transport Policing Command are appealing for information and witnesses following a fatal collision in Barnet.
Police were called at 19:00hrs on Tuesday, 22 December to the M1 southbound off-slip by Staples Corner roundabout following reports of a van in collision with a pedestrian.
Officers and the London Ambulance Service attended. The 55-year-old male pedestrian was pronounced dead at the scene.
Next of kin have been informed; formal identification is yet to take place.
A post-mortem examination will be held in due course.
The driver of the van stopped at the scene and was arrested in connection with the investigation. He remains in custody at a north London police station.
Any witnesses or anyone with any information is asked to call the Serious Collision Investigation Unit at Alperton traffic garage on 020 8991 9555.