Morning commuters in the North County and the South Bay were experiencing dense fog on the roadways Tuesday.
A dense fog advisory was issued through 8 a.m. Tuesday for San Diego's coastal areas, including the cities of Carlsbad, Encinitas, Chula Vista, National City and San Diego.
The advisory is issued when visibility is reduced to less than a quarter-mile. The National Weather Service said there will be pockets of fog along Interstate 5 and I-805 that will have low visibility.
Drivers are encouraged to slow down and to use low-beam headlights.
Flights from San Diego International Airport may also be affected though no delays were reported before 9 a.m. Check flight status here.