Anyone heading southbound on the Pacific Motorway is being warned to brace for major delays.
Two cars collided in the southbound lanes of the M1 at Arundel, near the Smith Street off-ramp, around 11.30am.
Emergency crews, including police and critical care paramedics, are currently on scene.
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Two people are being assessed, however, it’s not known yet known if they have suffered any injuries.
According to the Department of Transport and Main Roads, the right lane has been blocked.
Traffic is quickly building in the area, with motorists being urged to seek alternative routes.