One person has been killed in an early-morning crash on Sydney’s M4 involving eight cars and a truck.
The collision occurred about 5.50am near Mays Hill on the motorway’s approach to Church Street, causing chaos for many motorists during their commute.
Emergency services are on scene working on trapped and injured occupants.
Three people were receiving help from paramedics at the scene.
Three of four city bound lanes are blocked, and one westbound lane is blocked for emergency vehicles.
Vehicles are being diverted off the M4 at the Cumberland Highway on to the Great Western Highway and can then re-join the M4 at James Ruse Drive.
Lengthy delays have been advised by police, which has asked drivers to allow plenty of additional travel time for the diversion route.
Traffic is backed up for 15 kilometres at Huntingwood, affecting travelling towards the city on the M4.
Due to the severity of the crash, there is no indication of when all lanes will be reopened.
Paramedics treated multiple patients at the scene, including one man that could not be revived.
"It was an extremely distressing scene for all emergency services on arrival," NSW Ambulance's Andrew Wood told 2GB radio.
"There was debris and the accident was actually spread out over approximately 200 metres."
All city bound lanes on the M4 have been closed, with traffic queued back at least 15 kilometres.
It follows the death of a 20-year-old man in a crash in NSW's central west on Wednesday afternoon.
Police believe the ute he was travelling in left the road at Forbes and hit a tree, killing him and leaving the 24-year-old driver fighting for life.
He remains at Westmead Hospital in a critical condition.
The crash investigation unit is expected to investigate, police said.
Drivers have been urged to check livetraffic.com before travelling.
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