Motorists expecting to travel down Macquarie Pass will need to rethink their plans.
Flooding has closed the Illawarra Highway in both directions.
The highway was closed just after 11.30am due to a significant amount of water on the road.
Drivers are advised to avoid the area and use an alternative route.
Emergency services and Transport NSW crews are currently at the site.
Visit www.livetraffic.com for the latest information on road closures.