An woman has died and a man has been seriously injured in a crash on the Princes Hwy at Gerringong this morning.
The accident occurred just before 9am, about 500m north of the highway's intersection with Sims Rd.
The pair, in their 70s, were driving north on the highway when their van collided with a trailer attached to a vehicle heading south.
"There were two people trapped in the van as a result of the collision," Inspector Brian Pedersen said.
A rescue helicopter flew the woman to Wollongong Hospital where she died, police said.
The man was taken by road ambulance to Wollongong Hospital, where he is in a serious condition.
The Crash Investigation Unit is investigating the cause of the accident.
View Two trapped in Princes Hwy crash in a larger map
The Princes Hwy was expected to remain closed for several hours.
The Roads and Traffic Authority said northbound traffic was being diverted into Belinda St, and southbound traffic was being diverted into Fern St.
Northbound heavy vehicles over 10 tonnes are being diverted via Cambewarra Mountain and Macquarie Pass.
Southbound heavy vehicles over 10 tonnes are being diverted via Hume Highway and Picton Road.
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