Environment Canada issued a fog advisory early Friday morning stretching from the Edmonton region to the Red Deer area.
This includes Ponoka, Lacombe, Rimbey, Maskwacis, Sylvan Lake, Eckville and Blackfalds.
The weather agency said areas of dense fog developed in central Alberta overnight, and at 4:30 a.m. near-zero visibility fog was expected or was already occurring.
Highway cameras were showing fog along sections of the QEII Highway and parts of Anthony Henday Drive in Edmonton. Environment Canada said the visibility will improve as the fog dissipates later Friday morning.
If visibility is reduced while driving, motorists are advised to turn on their lights and maintain a safe following distance.
Environment Canada issues fog advisories when near zero visibility in fog is expected or occurring.