Four people have been injured in a five-car pile-up on Memorial Drive in Corrimal about 8pm.
Paramedics transported two women and a baby to Wollongong Hospital a short time ago.
A man was also assisted into an ambulance and taken to hospital under police escort.
It is understood he was driving the car that first made impact, setting off a sequence of collisions among cars queued at the Railway Street traffic lights.
Ambulance NSW Illawarra duty operations manager Inspector Norm Rees said the man was uncooperative and appeared to be under the influence.
Paramedics were initially called to assess 10 patients.
“We’ve triaged them all and discharged a few of them,” Insp Rees said.
“We have transported two women and a baby from the scene.”
The baby’s injuries included a swollen arm.
A Warilla 15-year-old was travelling in one of the cars involved in the collision.
"We stopped here and he's come up behind us and it went, 'bang'," she said.
"We moved forward and hit that guy's car because of the force of the impact. It felt like a roller coaster falling off - it was that abrupt stop all of a sudden, and the tightening of the seatbelt coming forward.
"My dad's looking for something in the car - his tooth. I'm fine other than a headache and a sore shoulder."
Northbound lanes were closed between Towradgi Road, Towradgi and Railway Street, Corrimal for more than an hour but have since reopened.