A man in his 80s died and one woman is seriously injured after a major road traffic accident on Colney Hatch Lane
A black Ford Fiesta broke down and was assisted by another motorist in a red Hyundai Getz.
A third car, a black VW Passatt, collided with the Hyundai, which in turn hit the Fiesta, police believe.
Police were called to the A406 at the Colney Hatch Lane junction on Wednesday morning.
London Ambulance Service was also called to the scene.
Formal identification has not yet taken place.
A post-mortem examination will take place today.
A woman was taken to a north London hospital. Her condition is serious but stable.
The driver of the VW Passatt has been arrested for causing death by dangerous driving and serious injury by dangerous driving. She is currently held at a north London police station.
Any witnesses are requested to call the north Serious Collision Investigation Unit on 0208 991 9555.
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