A multi-vehicle crash has closed a major Sydney road.
Emergency services are responding to the crash, which involves three cars.
Fire and Rescue NSW responded to the serious crash at Reservoir Rd on the M4 off ramp westbound at 7.11am.
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A NSW Ambulance spokesperson said paramedics were on scene.
7NEWS understands three people are being treated, though five people were involved in the crash.
The patients’ injuries are unclear at this stage, though are being reported as serious.
No one has been taken to hospital at this stage, though three are being prepared for transport.
A rescue helicopter is on scene.
The crash has had a “massive traffic impact”, a NSW Fire and Emergency Services spokesperson said.
Reservoir Rd at the M4 Motorway is closed in both directions following the serious crash.
The city bound off-ramp is closed with the diversion onto Great Western Hwy.
Southbound traffic on Reservoir Rd is diverting onto M4.
Northbound traffic is diverting onto Peter Brock Dr.
Traffic is heavy and motorists are advised to avoid the area or use Prospect Hwy instead.