Thick fog is blanketing much of the state including the Adelaide CBD making conditions dangerous for drivers.
We're being urged to take extra care, switch on headlights and stay a safe distance from the car in front.
The airport has put some inbound flights in holding patterns and delayed regional flights out of Adelaide.
If you're flying out today, check with your airline before heading to the airport.
The Bureau of Meteorology issued a road weather alert. Drivers are urged to slow down due to reduced visibility.